UBUNTU: Ubuntu-4.13.0-45.50

[mirror_ubuntu-artful-kernel.git] / drivers / scsi / dc395x.c

/*
 * dc395x.c
 *
 * Device Driver for Tekram DC395(U/UW/F), DC315(U)
 * PCI SCSI Bus Master Host Adapter
 * (SCSI chip set used Tekram ASIC TRM-S1040)
 *
 * Authors:
 *  C.L. Huang <ching@tekram.com.tw>
 *  Erich Chen <erich@tekram.com.tw>
 *  (C) Copyright 1995-1999 Tekram Technology Co., Ltd.
 *
 *  Kurt Garloff <garloff@suse.de>
 *  (C) 1999-2000 Kurt Garloff
 *
 *  Oliver Neukum <oliver@neukum.name>
 *  Ali Akcaagac <aliakc@web.de>
 *  Jamie Lenehan <lenehan@twibble.org>
 *  (C) 2003
 *
 * License: GNU GPL
 *
 *************************************************************************
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 ************************************************************************
 */
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/delay.h>
#include <linux/ctype.h>
#include <linux/blkdev.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/pci.h>
#include <linux/list.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <asm/io.h>

#include <scsi/scsi.h>
#include <scsi/scsicam.h>       /* needed for scsicam_bios_param */
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>

#include "dc395x.h"

#define DC395X_NAME     "dc395x"
#define DC395X_BANNER   "Tekram DC395(U/UW/F), DC315(U) - ASIC TRM-S1040"
#define DC395X_VERSION  "v2.05, 2004/03/08"

/*---------------------------------------------------------------------------
                                  Features
 ---------------------------------------------------------------------------*/
/*
 * Set to disable parts of the driver
 */
/*#define DC395x_NO_DISCONNECT*/
/*#define DC395x_NO_TAGQ*/
/*#define DC395x_NO_SYNC*/
/*#define DC395x_NO_WIDE*/

/*---------------------------------------------------------------------------
                                  Debugging
 ---------------------------------------------------------------------------*/
/*
 * Types of debugging that can be enabled and disabled
 */
#define DBG_KG          0x0001
#define DBG_0           0x0002
#define DBG_1           0x0004
#define DBG_SG          0x0020
#define DBG_FIFO        0x0040
#define DBG_PIO         0x0080


/*
 * Set set of things to output debugging for.
 * Undefine to remove all debugging
 */
/*#define DEBUG_MASK (DBG_0|DBG_1|DBG_SG|DBG_FIFO|DBG_PIO)*/
/*#define  DEBUG_MASK   DBG_0*/


/*
 * Output a kernel mesage at the specified level and append the
 * driver name and a ": " to the start of the message
 */
#define dprintkl(level, format, arg...)  \
    printk(level DC395X_NAME ": " format , ## arg)


#ifdef DEBUG_MASK
/*
 * print a debug message - this is formated with KERN_DEBUG, then the
 * driver name followed by a ": " and then the message is output. 
 * This also checks that the specified debug level is enabled before
 * outputing the message
 */
#define dprintkdbg(type, format, arg...) \
        do { \
                if ((type) & (DEBUG_MASK)) \
                        dprintkl(KERN_DEBUG , format , ## arg); \
        } while (0)

/*
 * Check if the specified type of debugging is enabled
 */
#define debug_enabled(type)     ((DEBUG_MASK) & (type))

#else
/*
 * No debugging. Do nothing
 */
#define dprintkdbg(type, format, arg...) \
        do {} while (0)
#define debug_enabled(type)     (0)

#endif


#ifndef PCI_VENDOR_ID_TEKRAM
#define PCI_VENDOR_ID_TEKRAM                    0x1DE1  /* Vendor ID    */
#endif
#ifndef PCI_DEVICE_ID_TEKRAM_TRMS1040
#define PCI_DEVICE_ID_TEKRAM_TRMS1040           0x0391  /* Device ID    */
#endif


#define DC395x_LOCK_IO(dev,flags)               spin_lock_irqsave(((struct Scsi_Host *)dev)->host_lock, flags)
#define DC395x_UNLOCK_IO(dev,flags)             spin_unlock_irqrestore(((struct Scsi_Host *)dev)->host_lock, flags)

#define DC395x_read8(acb,address)               (u8)(inb(acb->io_port_base + (address)))
#define DC395x_read16(acb,address)              (u16)(inw(acb->io_port_base + (address)))
#define DC395x_read32(acb,address)              (u32)(inl(acb->io_port_base + (address)))
#define DC395x_write8(acb,address,value)        outb((value), acb->io_port_base + (address))
#define DC395x_write16(acb,address,value)       outw((value), acb->io_port_base + (address))
#define DC395x_write32(acb,address,value)       outl((value), acb->io_port_base + (address))

/* cmd->result */
#define RES_TARGET              0x000000FF      /* Target State */
#define RES_TARGET_LNX  STATUS_MASK     /* Only official ... */
#define RES_ENDMSG              0x0000FF00      /* End Message */
#define RES_DID                 0x00FF0000      /* DID_ codes */
#define RES_DRV                 0xFF000000      /* DRIVER_ codes */

#define MK_RES(drv,did,msg,tgt) ((int)(drv)<<24 | (int)(did)<<16 | (int)(msg)<<8 | (int)(tgt))
#define MK_RES_LNX(drv,did,msg,tgt) ((int)(drv)<<24 | (int)(did)<<16 | (int)(msg)<<8 | (int)(tgt)<<1)

#define SET_RES_TARGET(who,tgt) { who &= ~RES_TARGET; who |= (int)(tgt); }
#define SET_RES_TARGET_LNX(who,tgt) { who &= ~RES_TARGET_LNX; who |= (int)(tgt) << 1; }
#define SET_RES_MSG(who,msg) { who &= ~RES_ENDMSG; who |= (int)(msg) << 8; }
#define SET_RES_DID(who,did) { who &= ~RES_DID; who |= (int)(did) << 16; }
#define SET_RES_DRV(who,drv) { who &= ~RES_DRV; who |= (int)(drv) << 24; }

#define TAG_NONE 255

/*
 * srb->segement_x is the hw sg list. It is always allocated as a
 * DC395x_MAX_SG_LISTENTRY entries in a linear block which does not
 * cross a page boundy.
 */
#define SEGMENTX_LEN    (sizeof(struct SGentry)*DC395x_MAX_SG_LISTENTRY)


struct SGentry {
        u32 address;            /* bus! address */
        u32 length;
};

/* The SEEPROM structure for TRM_S1040 */
struct NVRamTarget {
        u8 cfg0;                /* Target configuration byte 0  */
        u8 period;              /* Target period                */
        u8 cfg2;                /* Target configuration byte 2  */
        u8 cfg3;                /* Target configuration byte 3  */
};

struct NvRamType {
        u8 sub_vendor_id[2];    /* 0,1  Sub Vendor ID   */
        u8 sub_sys_id[2];       /* 2,3  Sub System ID   */
        u8 sub_class;           /* 4    Sub Class       */
        u8 vendor_id[2];        /* 5,6  Vendor ID       */
        u8 device_id[2];        /* 7,8  Device ID       */
        u8 reserved;            /* 9    Reserved        */
        struct NVRamTarget target[DC395x_MAX_SCSI_ID];
                                                /** 10,11,12,13
                                                 ** 14,15,16,17
                                                 ** ....
                                                 ** ....
                                                 ** 70,71,72,73
                                                 */
        u8 scsi_id;             /* 74 Host Adapter SCSI ID      */
        u8 channel_cfg;         /* 75 Channel configuration     */
        u8 delay_time;          /* 76 Power on delay time       */
        u8 max_tag;             /* 77 Maximum tags              */
        u8 reserved0;           /* 78  */
        u8 boot_target;         /* 79  */
        u8 boot_lun;            /* 80  */
        u8 reserved1;           /* 81  */
        u16 reserved2[22];      /* 82,..125 */
        u16 cksum;              /* 126,127 */
};

struct ScsiReqBlk {
        struct list_head list;          /* next/prev ptrs for srb lists */
        struct DeviceCtlBlk *dcb;
        struct scsi_cmnd *cmd;

        struct SGentry *segment_x;      /* Linear array of hw sg entries (up to 64 entries) */
        dma_addr_t sg_bus_addr;         /* Bus address of sg list (ie, of segment_x) */

        u8 sg_count;                    /* No of HW sg entries for this request */
        u8 sg_index;                    /* Index of HW sg entry for this request */
        size_t total_xfer_length;       /* Total number of bytes remaining to be transferred */
        size_t request_length;          /* Total number of bytes in this request */
        /*
         * The sense buffer handling function, request_sense, uses
         * the first hw sg entry (segment_x[0]) and the transfer
         * length (total_xfer_length). While doing this it stores the
         * original values into the last sg hw list
         * (srb->segment_x[DC395x_MAX_SG_LISTENTRY - 1] and the
         * total_xfer_length in xferred. These values are restored in
         * pci_unmap_srb_sense. This is the only place xferred is used.
         */
        size_t xferred;                 /* Saved copy of total_xfer_length */

        u16 state;

        u8 msgin_buf[6];
        u8 msgout_buf[6];

        u8 adapter_status;
        u8 target_status;
        u8 msg_count;
        u8 end_message;

        u8 tag_number;
        u8 status;
        u8 retry_count;
        u8 flag;

        u8 scsi_phase;
};

struct DeviceCtlBlk {
        struct list_head list;          /* next/prev ptrs for the dcb list */
        struct AdapterCtlBlk *acb;
        struct list_head srb_going_list;        /* head of going srb list */
        struct list_head srb_waiting_list;      /* head of waiting srb list */

        struct ScsiReqBlk *active_srb;
        u32 tag_mask;

        u16 max_command;

        u8 target_id;           /* SCSI Target ID  (SCSI Only) */
        u8 target_lun;          /* SCSI Log.  Unit (SCSI Only) */
        u8 identify_msg;
        u8 dev_mode;

        u8 inquiry7;            /* To store Inquiry flags */
        u8 sync_mode;           /* 0:async mode */
        u8 min_nego_period;     /* for nego. */
        u8 sync_period;         /* for reg.  */

        u8 sync_offset;         /* for reg. and nego.(low nibble) */
        u8 flag;
        u8 dev_type;
        u8 init_tcq_flag;
};

struct AdapterCtlBlk {
        struct Scsi_Host *scsi_host;

        unsigned long io_port_base;
        unsigned long io_port_len;

        struct list_head dcb_list;              /* head of going dcb list */
        struct DeviceCtlBlk *dcb_run_robin;
        struct DeviceCtlBlk *active_dcb;

        struct list_head srb_free_list;         /* head of free srb list */
        struct ScsiReqBlk *tmp_srb;
        struct timer_list waiting_timer;
        struct timer_list selto_timer;

        unsigned long last_reset;

        u16 srb_count;

        u8 sel_timeout;

        unsigned int irq_level;
        u8 tag_max_num;
        u8 acb_flag;
        u8 gmode2;

        u8 config;
        u8 lun_chk;
        u8 scan_devices;
        u8 hostid_bit;

        u8 dcb_map[DC395x_MAX_SCSI_ID];
        struct DeviceCtlBlk *children[DC395x_MAX_SCSI_ID][32];

        struct pci_dev *dev;

        u8 msg_len;

        struct ScsiReqBlk srb_array[DC395x_MAX_SRB_CNT];
        struct ScsiReqBlk srb;

        struct NvRamType eeprom;        /* eeprom settings for this adapter */
};


/*---------------------------------------------------------------------------
                            Forward declarations
 ---------------------------------------------------------------------------*/
static void data_out_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status);
static void data_in_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status);
static void command_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status);
static void status_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status);
static void msgout_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status);
static void msgin_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status);
static void data_out_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status);
static void data_in_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status);
static void command_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status);
static void status_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status);
static void msgout_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status);
static void msgin_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status);
static void nop0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status);
static void nop1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb, 
                u16 *pscsi_status);
static void set_basic_config(struct AdapterCtlBlk *acb);
static void cleanup_after_transfer(struct AdapterCtlBlk *acb,
                struct ScsiReqBlk *srb);
static void reset_scsi_bus(struct AdapterCtlBlk *acb);
static void data_io_transfer(struct AdapterCtlBlk *acb,
                struct ScsiReqBlk *srb, u16 io_dir);
static void disconnect(struct AdapterCtlBlk *acb);
static void reselect(struct AdapterCtlBlk *acb);
static u8 start_scsi(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
                struct ScsiReqBlk *srb);
static inline void enable_msgout_abort(struct AdapterCtlBlk *acb,
                struct ScsiReqBlk *srb);
static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb,
                struct ScsiReqBlk *srb);
static void doing_srb_done(struct AdapterCtlBlk *acb, u8 did_code,
                struct scsi_cmnd *cmd, u8 force);
static void scsi_reset_detect(struct AdapterCtlBlk *acb);
static void pci_unmap_srb(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb);
static void pci_unmap_srb_sense(struct AdapterCtlBlk *acb,
                struct ScsiReqBlk *srb);
static void srb_done(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
                struct ScsiReqBlk *srb);
static void request_sense(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
                struct ScsiReqBlk *srb);
static void set_xfer_rate(struct AdapterCtlBlk *acb,
                struct DeviceCtlBlk *dcb);
static void waiting_timeout(unsigned long ptr);


/*---------------------------------------------------------------------------
                                 Static Data
 ---------------------------------------------------------------------------*/
static u16 current_sync_offset = 0;

static void *dc395x_scsi_phase0[] = {
        data_out_phase0,/* phase:0 */
        data_in_phase0, /* phase:1 */
        command_phase0, /* phase:2 */
        status_phase0,  /* phase:3 */
        nop0,           /* phase:4 PH_BUS_FREE .. initial phase */
        nop0,           /* phase:5 PH_BUS_FREE .. initial phase */
        msgout_phase0,  /* phase:6 */
        msgin_phase0,   /* phase:7 */
};

static void *dc395x_scsi_phase1[] = {
        data_out_phase1,/* phase:0 */
        data_in_phase1, /* phase:1 */
        command_phase1, /* phase:2 */
        status_phase1,  /* phase:3 */
        nop1,           /* phase:4 PH_BUS_FREE .. initial phase */
        nop1,           /* phase:5 PH_BUS_FREE .. initial phase */
        msgout_phase1,  /* phase:6 */
        msgin_phase1,   /* phase:7 */
};

/*
 *Fast20:       000      50ns, 20.0 MHz
 *              001      75ns, 13.3 MHz
 *              010     100ns, 10.0 MHz
 *              011     125ns,  8.0 MHz
 *              100     150ns,  6.6 MHz
 *              101     175ns,  5.7 MHz
 *              110     200ns,  5.0 MHz
 *              111     250ns,  4.0 MHz
 *
 *Fast40(LVDS): 000      25ns, 40.0 MHz
 *              001      50ns, 20.0 MHz
 *              010      75ns, 13.3 MHz
 *              011     100ns, 10.0 MHz
 *              100     125ns,  8.0 MHz
 *              101     150ns,  6.6 MHz
 *              110     175ns,  5.7 MHz
 *              111     200ns,  5.0 MHz
 */
/*static u8     clock_period[] = {12,19,25,31,37,44,50,62};*/

/* real period:48ns,76ns,100ns,124ns,148ns,176ns,200ns,248ns */
static u8 clock_period[] = { 12, 18, 25, 31, 37, 43, 50, 62 };
static u16 clock_speed[] = { 200, 133, 100, 80, 67, 58, 50, 40 };


/*---------------------------------------------------------------------------
                                Configuration
  ---------------------------------------------------------------------------*/
/*
 * Module/boot parameters currently effect *all* instances of the
 * card in the system.
 */

/*
 * Command line parameters are stored in a structure below.
 * These are the index's into the structure for the various
 * command line options.
 */
#define CFG_ADAPTER_ID          0
#define CFG_MAX_SPEED           1
#define CFG_DEV_MODE            2
#define CFG_ADAPTER_MODE        3
#define CFG_TAGS                4
#define CFG_RESET_DELAY         5

#define CFG_NUM                 6       /* number of configuration items */


/*
 * Value used to indicate that a command line override
 * hasn't been used to modify the value.
 */
#define CFG_PARAM_UNSET -1


/*
 * Hold command line parameters.
 */
struct ParameterData {
        int value;              /* value of this setting */
        int min;                /* minimum value */
        int max;                /* maximum value */
        int def;                /* default value */
        int safe;               /* safe value */
};
static struct ParameterData cfg_data[] = {
        { /* adapter id */
                CFG_PARAM_UNSET,
                0,
                15,
                7,
                7
        },
        { /* max speed */
                CFG_PARAM_UNSET,
                  0,
                  7,
                  1,    /* 13.3Mhz */
                  4,    /*  6.7Hmz */
        },
        { /* dev mode */
                CFG_PARAM_UNSET,
                0,
                0x3f,
                NTC_DO_PARITY_CHK | NTC_DO_DISCONNECT | NTC_DO_SYNC_NEGO |
                        NTC_DO_WIDE_NEGO | NTC_DO_TAG_QUEUEING |
                        NTC_DO_SEND_START,
                NTC_DO_PARITY_CHK | NTC_DO_SEND_START
        },
        { /* adapter mode */
                CFG_PARAM_UNSET,
                0,
                0x2f,
                NAC_SCANLUN |
                NAC_GT2DRIVES | NAC_GREATER_1G | NAC_POWERON_SCSI_RESET
                        /*| NAC_ACTIVE_NEG*/,
                NAC_GT2DRIVES | NAC_GREATER_1G | NAC_POWERON_SCSI_RESET | 0x08
        },
        { /* tags */
                CFG_PARAM_UNSET,
                0,
                5,
                3,      /* 16 tags (??) */
                2,
        },
        { /* reset delay */
                CFG_PARAM_UNSET,
                0,
                180,
                1,      /* 1 second */
                10,     /* 10 seconds */
        }
};


/*
 * Safe settings. If set to zero the BIOS/default values with
 * command line overrides will be used. If set to 1 then safe and
 * slow settings will be used.
 */
static bool use_safe_settings = 0;
module_param_named(safe, use_safe_settings, bool, 0);
MODULE_PARM_DESC(safe, "Use safe and slow settings only. Default: false");


module_param_named(adapter_id, cfg_data[CFG_ADAPTER_ID].value, int, 0);
MODULE_PARM_DESC(adapter_id, "Adapter SCSI ID. Default 7 (0-15)");

module_param_named(max_speed, cfg_data[CFG_MAX_SPEED].value, int, 0);
MODULE_PARM_DESC(max_speed, "Maximum bus speed. Default 1 (0-7) Speeds: 0=20, 1=13.3, 2=10, 3=8, 4=6.7, 5=5.8, 6=5, 7=4 Mhz");

module_param_named(dev_mode, cfg_data[CFG_DEV_MODE].value, int, 0);
MODULE_PARM_DESC(dev_mode, "Device mode.");

module_param_named(adapter_mode, cfg_data[CFG_ADAPTER_MODE].value, int, 0);
MODULE_PARM_DESC(adapter_mode, "Adapter mode.");

module_param_named(tags, cfg_data[CFG_TAGS].value, int, 0);
MODULE_PARM_DESC(tags, "Number of tags (1<<x). Default 3 (0-5)");

module_param_named(reset_delay, cfg_data[CFG_RESET_DELAY].value, int, 0);
MODULE_PARM_DESC(reset_delay, "Reset delay in seconds. Default 1 (0-180)");


/**
 * set_safe_settings - if the use_safe_settings option is set then
 * set all values to the safe and slow values.
 **/
static void set_safe_settings(void)
{
        if (use_safe_settings)
        {
                int i;

                dprintkl(KERN_INFO, "Using safe settings.\n");
                for (i = 0; i < CFG_NUM; i++)
                {
                        cfg_data[i].value = cfg_data[i].safe;
                }
        }
}


/**
 * fix_settings - reset any boot parameters which are out of range
 * back to the default values.
 **/
static void fix_settings(void)
{
        int i;

        dprintkdbg(DBG_1,
                "setup: AdapterId=%08x MaxSpeed=%08x DevMode=%08x "
                "AdapterMode=%08x Tags=%08x ResetDelay=%08x\n",
                cfg_data[CFG_ADAPTER_ID].value,
                cfg_data[CFG_MAX_SPEED].value,
                cfg_data[CFG_DEV_MODE].value,
                cfg_data[CFG_ADAPTER_MODE].value,
                cfg_data[CFG_TAGS].value,
                cfg_data[CFG_RESET_DELAY].value);
        for (i = 0; i < CFG_NUM; i++)
        {
                if (cfg_data[i].value < cfg_data[i].min
                    || cfg_data[i].value > cfg_data[i].max)
                        cfg_data[i].value = cfg_data[i].def;
        }
}



/*
 * Mapping from the eeprom delay index value (index into this array)
 * to the number of actual seconds that the delay should be for.
 */
static char eeprom_index_to_delay_map[] =
        { 1, 3, 5, 10, 16, 30, 60, 120 };


/**
 * eeprom_index_to_delay - Take the eeprom delay setting and convert it
 * into a number of seconds.
 *
 * @eeprom: The eeprom structure in which we find the delay index to map.
 **/
static void eeprom_index_to_delay(struct NvRamType *eeprom)
{
        eeprom->delay_time = eeprom_index_to_delay_map[eeprom->delay_time];
}


/**
 * delay_to_eeprom_index - Take a delay in seconds and return the
 * closest eeprom index which will delay for at least that amount of
 * seconds.
 *
 * @delay: The delay, in seconds, to find the eeprom index for.
 **/
static int delay_to_eeprom_index(int delay)
{
        u8 idx = 0;
        while (idx < 7 && eeprom_index_to_delay_map[idx] < delay)
                idx++;
        return idx;
}


/**
 * eeprom_override - Override the eeprom settings, in the provided
 * eeprom structure, with values that have been set on the command
 * line.
 *
 * @eeprom: The eeprom data to override with command line options.
 **/
static void eeprom_override(struct NvRamType *eeprom)
{
        u8 id;

        /* Adapter Settings */
        if (cfg_data[CFG_ADAPTER_ID].value != CFG_PARAM_UNSET)
                eeprom->scsi_id = (u8)cfg_data[CFG_ADAPTER_ID].value;

        if (cfg_data[CFG_ADAPTER_MODE].value != CFG_PARAM_UNSET)
                eeprom->channel_cfg = (u8)cfg_data[CFG_ADAPTER_MODE].value;

        if (cfg_data[CFG_RESET_DELAY].value != CFG_PARAM_UNSET)
                eeprom->delay_time = delay_to_eeprom_index(
                                        cfg_data[CFG_RESET_DELAY].value);

        if (cfg_data[CFG_TAGS].value != CFG_PARAM_UNSET)
                eeprom->max_tag = (u8)cfg_data[CFG_TAGS].value;

        /* Device Settings */
        for (id = 0; id < DC395x_MAX_SCSI_ID; id++) {
                if (cfg_data[CFG_DEV_MODE].value != CFG_PARAM_UNSET)
                        eeprom->target[id].cfg0 =
                                (u8)cfg_data[CFG_DEV_MODE].value;

                if (cfg_data[CFG_MAX_SPEED].value != CFG_PARAM_UNSET)
                        eeprom->target[id].period =
                                (u8)cfg_data[CFG_MAX_SPEED].value;

        }
}


/*---------------------------------------------------------------------------
 ---------------------------------------------------------------------------*/

static unsigned int list_size(struct list_head *head)
{
        unsigned int count = 0;
        struct list_head *pos;
        list_for_each(pos, head)
                count++;
        return count;
}


static struct DeviceCtlBlk *dcb_get_next(struct list_head *head,
                struct DeviceCtlBlk *pos)
{
        int use_next = 0;
        struct DeviceCtlBlk* next = NULL;
        struct DeviceCtlBlk* i;

        if (list_empty(head))
                return NULL;

        /* find supplied dcb and then select the next one */
        list_for_each_entry(i, head, list)
                if (use_next) {
                        next = i;
                        break;
                } else if (i == pos) {
                        use_next = 1;
                }
        /* if no next one take the head one (ie, wraparound) */
        if (!next)
                list_for_each_entry(i, head, list) {
                        next = i;
                        break;
                }

        return next;
}


static void free_tag(struct DeviceCtlBlk *dcb, struct ScsiReqBlk *srb)
{
        if (srb->tag_number < 255) {
                dcb->tag_mask &= ~(1 << srb->tag_number);       /* free tag mask */
                srb->tag_number = 255;
        }
}


/* Find cmd in SRB list */
static inline struct ScsiReqBlk *find_cmd(struct scsi_cmnd *cmd,
                struct list_head *head)
{
        struct ScsiReqBlk *i;
        list_for_each_entry(i, head, list)
                if (i->cmd == cmd)
                        return i;
        return NULL;
}


static struct ScsiReqBlk *srb_get_free(struct AdapterCtlBlk *acb)
{
        struct list_head *head = &acb->srb_free_list;
        struct ScsiReqBlk *srb = NULL;

        if (!list_empty(head)) {
                srb = list_entry(head->next, struct ScsiReqBlk, list);
                list_del(head->next);
                dprintkdbg(DBG_0, "srb_get_free: srb=%p\n", srb);
        }
        return srb;
}


static void srb_free_insert(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
{
        dprintkdbg(DBG_0, "srb_free_insert: srb=%p\n", srb);
        list_add_tail(&srb->list, &acb->srb_free_list);
}


static void srb_waiting_insert(struct DeviceCtlBlk *dcb,
                struct ScsiReqBlk *srb)
{
        dprintkdbg(DBG_0, "srb_waiting_insert: (0x%p) <%02i-%i> srb=%p\n",
                srb->cmd, dcb->target_id, dcb->target_lun, srb);
        list_add(&srb->list, &dcb->srb_waiting_list);
}


static void srb_waiting_append(struct DeviceCtlBlk *dcb,
                struct ScsiReqBlk *srb)
{
        dprintkdbg(DBG_0, "srb_waiting_append: (0x%p) <%02i-%i> srb=%p\n",
                 srb->cmd, dcb->target_id, dcb->target_lun, srb);
        list_add_tail(&srb->list, &dcb->srb_waiting_list);
}


static void srb_going_append(struct DeviceCtlBlk *dcb, struct ScsiReqBlk *srb)
{
        dprintkdbg(DBG_0, "srb_going_append: (0x%p) <%02i-%i> srb=%p\n",
                srb->cmd, dcb->target_id, dcb->target_lun, srb);
        list_add_tail(&srb->list, &dcb->srb_going_list);
}


static void srb_going_remove(struct DeviceCtlBlk *dcb, struct ScsiReqBlk *srb)
{
        struct ScsiReqBlk *i;
        struct ScsiReqBlk *tmp;
        dprintkdbg(DBG_0, "srb_going_remove: (0x%p) <%02i-%i> srb=%p\n",
                srb->cmd, dcb->target_id, dcb->target_lun, srb);

        list_for_each_entry_safe(i, tmp, &dcb->srb_going_list, list)
                if (i == srb) {
                        list_del(&srb->list);
                        break;
                }
}


static void srb_waiting_remove(struct DeviceCtlBlk *dcb,
                struct ScsiReqBlk *srb)
{
        struct ScsiReqBlk *i;
        struct ScsiReqBlk *tmp;
        dprintkdbg(DBG_0, "srb_waiting_remove: (0x%p) <%02i-%i> srb=%p\n",
                srb->cmd, dcb->target_id, dcb->target_lun, srb);

        list_for_each_entry_safe(i, tmp, &dcb->srb_waiting_list, list)
                if (i == srb) {
                        list_del(&srb->list);
                        break;
                }
}


static void srb_going_to_waiting_move(struct DeviceCtlBlk *dcb,
                struct ScsiReqBlk *srb)
{
        dprintkdbg(DBG_0,
                "srb_going_to_waiting_move: (0x%p) <%02i-%i> srb=%p\n",
                srb->cmd, dcb->target_id, dcb->target_lun, srb);
        list_move(&srb->list, &dcb->srb_waiting_list);
}


static void srb_waiting_to_going_move(struct DeviceCtlBlk *dcb,
                struct ScsiReqBlk *srb)
{
        dprintkdbg(DBG_0,
                "srb_waiting_to_going_move: (0x%p) <%02i-%i> srb=%p\n",
                srb->cmd, dcb->target_id, dcb->target_lun, srb);
        list_move(&srb->list, &dcb->srb_going_list);
}


/* Sets the timer to wake us up */
static void waiting_set_timer(struct AdapterCtlBlk *acb, unsigned long to)
{
        if (timer_pending(&acb->waiting_timer))
                return;
        init_timer(&acb->waiting_timer);
        acb->waiting_timer.function = waiting_timeout;
        acb->waiting_timer.data = (unsigned long) acb;
        if (time_before(jiffies + to, acb->last_reset - HZ / 2))
                acb->waiting_timer.expires =
                    acb->last_reset - HZ / 2 + 1;
        else
                acb->waiting_timer.expires = jiffies + to + 1;
        add_timer(&acb->waiting_timer);
}


/* Send the next command from the waiting list to the bus */
static void waiting_process_next(struct AdapterCtlBlk *acb)
{
        struct DeviceCtlBlk *start = NULL;
        struct DeviceCtlBlk *pos;
        struct DeviceCtlBlk *dcb;
        struct ScsiReqBlk *srb;
        struct list_head *dcb_list_head = &acb->dcb_list;

        if (acb->active_dcb
            || (acb->acb_flag & (RESET_DETECT + RESET_DONE + RESET_DEV)))
                return;

        if (timer_pending(&acb->waiting_timer))
                del_timer(&acb->waiting_timer);

        if (list_empty(dcb_list_head))
                return;

        /*
         * Find the starting dcb. Need to find it again in the list
         * since the list may have changed since we set the ptr to it
         */
        list_for_each_entry(dcb, dcb_list_head, list)
                if (dcb == acb->dcb_run_robin) {
                        start = dcb;
                        break;
                }
        if (!start) {
                /* This can happen! */
                start = list_entry(dcb_list_head->next, typeof(*start), list);
                acb->dcb_run_robin = start;
        }


        /*
         * Loop over the dcb, but we start somewhere (potentially) in
         * the middle of the loop so we need to manully do this.
         */
        pos = start;
        do {
                struct list_head *waiting_list_head = &pos->srb_waiting_list;

                /* Make sure, the next another device gets scheduled ... */
                acb->dcb_run_robin = dcb_get_next(dcb_list_head,
                                                  acb->dcb_run_robin);

                if (list_empty(waiting_list_head) ||
                    pos->max_command <= list_size(&pos->srb_going_list)) {
                        /* move to next dcb */
                        pos = dcb_get_next(dcb_list_head, pos);
                } else {
                        srb = list_entry(waiting_list_head->next,
                                         struct ScsiReqBlk, list);

                        /* Try to send to the bus */
                        if (!start_scsi(acb, pos, srb))
                                srb_waiting_to_going_move(pos, srb);
                        else
                                waiting_set_timer(acb, HZ/50);
                        break;
                }
        } while (pos != start);
}


/* Wake up waiting queue */
static void waiting_timeout(unsigned long ptr)
{
        unsigned long flags;
        struct AdapterCtlBlk *acb = (struct AdapterCtlBlk *)ptr;
        dprintkdbg(DBG_1,
                "waiting_timeout: Queue woken up by timer. acb=%p\n", acb);
        DC395x_LOCK_IO(acb->scsi_host, flags);
        waiting_process_next(acb);
        DC395x_UNLOCK_IO(acb->scsi_host, flags);
}


/* Get the DCB for a given ID/LUN combination */
static struct DeviceCtlBlk *find_dcb(struct AdapterCtlBlk *acb, u8 id, u8 lun)
{
        return acb->children[id][lun];
}


/* Send SCSI Request Block (srb) to adapter (acb) */
static void send_srb(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
{
        struct DeviceCtlBlk *dcb = srb->dcb;

        if (dcb->max_command <= list_size(&dcb->srb_going_list) ||
            acb->active_dcb ||
            (acb->acb_flag & (RESET_DETECT + RESET_DONE + RESET_DEV))) {
                srb_waiting_append(dcb, srb);
                waiting_process_next(acb);
                return;
        }

        if (!start_scsi(acb, dcb, srb))
                srb_going_append(dcb, srb);
        else {
                srb_waiting_insert(dcb, srb);
                waiting_set_timer(acb, HZ / 50);
        }
}

/* Prepare SRB for being sent to Device DCB w/ command *cmd */
static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb,
                struct ScsiReqBlk *srb)
{
        int nseg;
        enum dma_data_direction dir = cmd->sc_data_direction;
        dprintkdbg(DBG_0, "build_srb: (0x%p) <%02i-%i>\n",
                cmd, dcb->target_id, dcb->target_lun);

        srb->dcb = dcb;
        srb->cmd = cmd;
        srb->sg_count = 0;
        srb->total_xfer_length = 0;
        srb->sg_bus_addr = 0;
        srb->sg_index = 0;
        srb->adapter_status = 0;
        srb->target_status = 0;
        srb->msg_count = 0;
        srb->status = 0;
        srb->flag = 0;
        srb->state = 0;
        srb->retry_count = 0;
        srb->tag_number = TAG_NONE;
        srb->scsi_phase = PH_BUS_FREE;  /* initial phase */
        srb->end_message = 0;

        nseg = scsi_dma_map(cmd);
        BUG_ON(nseg < 0);

        if (dir == PCI_DMA_NONE || !nseg) {
                dprintkdbg(DBG_0,
                        "build_srb: [0] len=%d buf=%p use_sg=%d !MAP=%08x\n",
                           cmd->bufflen, scsi_sglist(cmd), scsi_sg_count(cmd),
                           srb->segment_x[0].address);
        } else {
                int i;
                u32 reqlen = scsi_bufflen(cmd);
                struct scatterlist *sg;
                struct SGentry *sgp = srb->segment_x;

                srb->sg_count = nseg;

                dprintkdbg(DBG_0,
                           "build_srb: [n] len=%d buf=%p use_sg=%d segs=%d\n",
                           reqlen, scsi_sglist(cmd), scsi_sg_count(cmd),
                           srb->sg_count);

                scsi_for_each_sg(cmd, sg, srb->sg_count, i) {
                        u32 busaddr = (u32)sg_dma_address(sg);
                        u32 seglen = (u32)sg->length;
                        sgp[i].address = busaddr;
                        sgp[i].length = seglen;
                        srb->total_xfer_length += seglen;
                }
                sgp += srb->sg_count - 1;

                /*
                 * adjust last page if too big as it is allocated
                 * on even page boundaries
                 */
                if (srb->total_xfer_length > reqlen) {
                        sgp->length -= (srb->total_xfer_length - reqlen);
                        srb->total_xfer_length = reqlen;
                }

                /* Fixup for WIDE padding - make sure length is even */
                if (dcb->sync_period & WIDE_SYNC &&
                    srb->total_xfer_length % 2) {
                        srb->total_xfer_length++;
                        sgp->length++;
                }

                srb->sg_bus_addr = pci_map_single(dcb->acb->dev,
                                                srb->segment_x,
                                                SEGMENTX_LEN,
                                                PCI_DMA_TODEVICE);

                dprintkdbg(DBG_SG, "build_srb: [n] map sg %p->%08x(%05x)\n",
                        srb->segment_x, srb->sg_bus_addr, SEGMENTX_LEN);
        }

        srb->request_length = srb->total_xfer_length;
}


/**
 * dc395x_queue_command - queue scsi command passed from the mid
 * layer, invoke 'done' on completion
 *
 * @cmd: pointer to scsi command object
 * @done: function pointer to be invoked on completion
 *
 * Returns 1 if the adapter (host) is busy, else returns 0. One
 * reason for an adapter to be busy is that the number
 * of outstanding queued commands is already equal to
 * struct Scsi_Host::can_queue .
 *
 * Required: if struct Scsi_Host::can_queue is ever non-zero
 *           then this function is required.
 *
 * Locks: struct Scsi_Host::host_lock held on entry (with "irqsave")
 *        and is expected to be held on return.
 *
 **/
static int dc395x_queue_command_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
{
        struct DeviceCtlBlk *dcb;
        struct ScsiReqBlk *srb;
        struct AdapterCtlBlk *acb =
            (struct AdapterCtlBlk *)cmd->device->host->hostdata;
        dprintkdbg(DBG_0, "queue_command: (0x%p) <%02i-%i> cmnd=0x%02x\n",
                cmd, cmd->device->id, (u8)cmd->device->lun, cmd->cmnd[0]);

        /* Assume BAD_TARGET; will be cleared later */
        cmd->result = DID_BAD_TARGET << 16;

        /* ignore invalid targets */
        if (cmd->device->id >= acb->scsi_host->max_id ||
            cmd->device->lun >= acb->scsi_host->max_lun ||
            cmd->device->lun >31) {
                goto complete;
        }

        /* does the specified lun on the specified device exist */
        if (!(acb->dcb_map[cmd->device->id] & (1 << cmd->device->lun))) {
                dprintkl(KERN_INFO, "queue_command: Ignore target <%02i-%i>\n",
                        cmd->device->id, (u8)cmd->device->lun);
                goto complete;
        }

        /* do we have a DCB for the device */
        dcb = find_dcb(acb, cmd->device->id, cmd->device->lun);
        if (!dcb) {
                /* should never happen */
                dprintkl(KERN_ERR, "queue_command: No such device <%02i-%i>",
                        cmd->device->id, (u8)cmd->device->lun);
                goto complete;
        }

        /* set callback and clear result in the command */
        cmd->scsi_done = done;
        cmd->result = 0;

        srb = srb_get_free(acb);
        if (!srb)
        {
                /*
                 * Return 1 since we are unable to queue this command at this
                 * point in time.
                 */
                dprintkdbg(DBG_0, "queue_command: No free srb's\n");
                return 1;
        }

        build_srb(cmd, dcb, srb);

        if (!list_empty(&dcb->srb_waiting_list)) {
                /* append to waiting queue */
                srb_waiting_append(dcb, srb);
                waiting_process_next(acb);
        } else {
                /* process immediately */
                send_srb(acb, srb);
        }
        dprintkdbg(DBG_1, "queue_command: (0x%p) done\n", cmd);
        return 0;

complete:
        /*
         * Complete the command immediatey, and then return 0 to
         * indicate that we have handled the command. This is usually
         * done when the commad is for things like non existent
         * devices.
         */
        done(cmd);
        return 0;
}

static DEF_SCSI_QCMD(dc395x_queue_command)

/*
 * Return the disk geometry for the given SCSI device.
 */
static int dc395x_bios_param(struct scsi_device *sdev,
                struct block_device *bdev, sector_t capacity, int *info)
{
#ifdef CONFIG_SCSI_DC395x_TRMS1040_TRADMAP
        int heads, sectors, cylinders;
        struct AdapterCtlBlk *acb;
        int size = capacity;

        dprintkdbg(DBG_0, "dc395x_bios_param..............\n");
        acb = (struct AdapterCtlBlk *)sdev->host->hostdata;
        heads = 64;
        sectors = 32;
        cylinders = size / (heads * sectors);

        if ((acb->gmode2 & NAC_GREATER_1G) && (cylinders > 1024)) {
                heads = 255;
                sectors = 63;
                cylinders = size / (heads * sectors);
        }
        geom[0] = heads;
        geom[1] = sectors;
        geom[2] = cylinders;
        return 0;
#else
        return scsicam_bios_param(bdev, capacity, info);
#endif
}


static void dump_register_info(struct AdapterCtlBlk *acb,
                struct DeviceCtlBlk *dcb, struct ScsiReqBlk *srb)
{
        u16 pstat;
        struct pci_dev *dev = acb->dev;
        pci_read_config_word(dev, PCI_STATUS, &pstat);
        if (!dcb)
                dcb = acb->active_dcb;
        if (!srb && dcb)
                srb = dcb->active_srb;
        if (srb) {
                if (!srb->cmd)
                        dprintkl(KERN_INFO, "dump: srb=%p cmd=%p OOOPS!\n",
                                srb, srb->cmd);
                else
                        dprintkl(KERN_INFO, "dump: srb=%p cmd=%p "
                                 "cmnd=0x%02x <%02i-%i>\n",
                                srb, srb->cmd,
                                srb->cmd->cmnd[0], srb->cmd->device->id,
                                (u8)srb->cmd->device->lun);
                printk("  sglist=%p cnt=%i idx=%i len=%zu\n",
                       srb->segment_x, srb->sg_count, srb->sg_index,
                       srb->total_xfer_length);
                printk("  state=0x%04x status=0x%02x phase=0x%02x (%sconn.)\n",
                       srb->state, srb->status, srb->scsi_phase,
                       (acb->active_dcb) ? "" : "not");
        }
        dprintkl(KERN_INFO, "dump: SCSI{status=0x%04x fifocnt=0x%02x "
                "signals=0x%02x irqstat=0x%02x sync=0x%02x target=0x%02x "
                "rselid=0x%02x ctr=0x%08x irqen=0x%02x config=0x%04x "
                "config2=0x%02x cmd=0x%02x selto=0x%02x}\n",
                DC395x_read16(acb, TRM_S1040_SCSI_STATUS),
                DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT),
                DC395x_read8(acb, TRM_S1040_SCSI_SIGNAL),
                DC395x_read8(acb, TRM_S1040_SCSI_INTSTATUS),
                DC395x_read8(acb, TRM_S1040_SCSI_SYNC),
                DC395x_read8(acb, TRM_S1040_SCSI_TARGETID),
                DC395x_read8(acb, TRM_S1040_SCSI_IDMSG),
                DC395x_read32(acb, TRM_S1040_SCSI_COUNTER),
                DC395x_read8(acb, TRM_S1040_SCSI_INTEN),
                DC395x_read16(acb, TRM_S1040_SCSI_CONFIG0),
                DC395x_read8(acb, TRM_S1040_SCSI_CONFIG2),
                DC395x_read8(acb, TRM_S1040_SCSI_COMMAND),
                DC395x_read8(acb, TRM_S1040_SCSI_TIMEOUT));
        dprintkl(KERN_INFO, "dump: DMA{cmd=0x%04x fifocnt=0x%02x fstat=0x%02x "
                "irqstat=0x%02x irqen=0x%02x cfg=0x%04x tctr=0x%08x "
                "ctctr=0x%08x addr=0x%08x:0x%08x}\n",
                DC395x_read16(acb, TRM_S1040_DMA_COMMAND),
                DC395x_read8(acb, TRM_S1040_DMA_FIFOCNT),
                DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT),
                DC395x_read8(acb, TRM_S1040_DMA_STATUS),
                DC395x_read8(acb, TRM_S1040_DMA_INTEN),
                DC395x_read16(acb, TRM_S1040_DMA_CONFIG),
                DC395x_read32(acb, TRM_S1040_DMA_XCNT),
                DC395x_read32(acb, TRM_S1040_DMA_CXCNT),
                DC395x_read32(acb, TRM_S1040_DMA_XHIGHADDR),
                DC395x_read32(acb, TRM_S1040_DMA_XLOWADDR));
        dprintkl(KERN_INFO, "dump: gen{gctrl=0x%02x gstat=0x%02x gtmr=0x%02x} "
                "pci{status=0x%04x}\n",
                DC395x_read8(acb, TRM_S1040_GEN_CONTROL),
                DC395x_read8(acb, TRM_S1040_GEN_STATUS),
                DC395x_read8(acb, TRM_S1040_GEN_TIMER),
                pstat);
}


static inline void clear_fifo(struct AdapterCtlBlk *acb, char *txt)
{
#if debug_enabled(DBG_FIFO)
        u8 lines = DC395x_read8(acb, TRM_S1040_SCSI_SIGNAL);
        u8 fifocnt = DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT);
        if (!(fifocnt & 0x40))
                dprintkdbg(DBG_FIFO,
                        "clear_fifo: (%i bytes) on phase %02x in %s\n",
                        fifocnt & 0x3f, lines, txt);
#endif
        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_CLRFIFO);
}


static void reset_dev_param(struct AdapterCtlBlk *acb)
{
        struct DeviceCtlBlk *dcb;
        struct NvRamType *eeprom = &acb->eeprom;
        dprintkdbg(DBG_0, "reset_dev_param: acb=%p\n", acb);

        list_for_each_entry(dcb, &acb->dcb_list, list) {
                u8 period_index;

                dcb->sync_mode &= ~(SYNC_NEGO_DONE + WIDE_NEGO_DONE);
                dcb->sync_period = 0;
                dcb->sync_offset = 0;

                dcb->dev_mode = eeprom->target[dcb->target_id].cfg0;
                period_index = eeprom->target[dcb->target_id].period & 0x07;
                dcb->min_nego_period = clock_period[period_index];
                if (!(dcb->dev_mode & NTC_DO_WIDE_NEGO)
                    || !(acb->config & HCC_WIDE_CARD))
                        dcb->sync_mode &= ~WIDE_NEGO_ENABLE;
        }
}


/*
 * perform a hard reset on the SCSI bus
 * @cmd - some command for this host (for fetching hooks)
 * Returns: SUCCESS (0x2002) on success, else FAILED (0x2003).
 */
static int __dc395x_eh_bus_reset(struct scsi_cmnd *cmd)
{
        struct AdapterCtlBlk *acb =
                (struct AdapterCtlBlk *)cmd->device->host->hostdata;
        dprintkl(KERN_INFO,
                "eh_bus_reset: (0%p) target=<%02i-%i> cmd=%p\n",
                cmd, cmd->device->id, (u8)cmd->device->lun, cmd);

        if (timer_pending(&acb->waiting_timer))
                del_timer(&acb->waiting_timer);

        /*
         * disable interrupt    
         */
        DC395x_write8(acb, TRM_S1040_DMA_INTEN, 0x00);
        DC395x_write8(acb, TRM_S1040_SCSI_INTEN, 0x00);
        DC395x_write8(acb, TRM_S1040_SCSI_CONTROL, DO_RSTMODULE);
        DC395x_write8(acb, TRM_S1040_DMA_CONTROL, DMARESETMODULE);

        reset_scsi_bus(acb);
        udelay(500);

        /* We may be in serious trouble. Wait some seconds */
        acb->last_reset =
            jiffies + 3 * HZ / 2 +
            HZ * acb->eeprom.delay_time;

        /*
         * re-enable interrupt      
         */
        /* Clear SCSI FIFO          */
        DC395x_write8(acb, TRM_S1040_DMA_CONTROL, CLRXFIFO);
        clear_fifo(acb, "eh_bus_reset");
        /* Delete pending IRQ */
        DC395x_read8(acb, TRM_S1040_SCSI_INTSTATUS);
        set_basic_config(acb);

        reset_dev_param(acb);
        doing_srb_done(acb, DID_RESET, cmd, 0);
        acb->active_dcb = NULL;
        acb->acb_flag = 0;      /* RESET_DETECT, RESET_DONE ,RESET_DEV */
        waiting_process_next(acb);

        return SUCCESS;
}

static int dc395x_eh_bus_reset(struct scsi_cmnd *cmd)
{
        int rc;

        spin_lock_irq(cmd->device->host->host_lock);
        rc = __dc395x_eh_bus_reset(cmd);
        spin_unlock_irq(cmd->device->host->host_lock);

        return rc;
}

/*
 * abort an errant SCSI command
 * @cmd - command to be aborted
 * Returns: SUCCESS (0x2002) on success, else FAILED (0x2003).
 */
static int dc395x_eh_abort(struct scsi_cmnd *cmd)
{
        /*
         * Look into our command queues: If it has not been sent already,
         * we remove it and return success. Otherwise fail.
         */
        struct AdapterCtlBlk *acb =
            (struct AdapterCtlBlk *)cmd->device->host->hostdata;
        struct DeviceCtlBlk *dcb;
        struct ScsiReqBlk *srb;
        dprintkl(KERN_INFO, "eh_abort: (0x%p) target=<%02i-%i> cmd=%p\n",
                cmd, cmd->device->id, (u8)cmd->device->lun, cmd);

        dcb = find_dcb(acb, cmd->device->id, cmd->device->lun);
        if (!dcb) {
                dprintkl(KERN_DEBUG, "eh_abort: No such device\n");
                return FAILED;
        }

        srb = find_cmd(cmd, &dcb->srb_waiting_list);
        if (srb) {
                srb_waiting_remove(dcb, srb);
                pci_unmap_srb_sense(acb, srb);
                pci_unmap_srb(acb, srb);
                free_tag(dcb, srb);
                srb_free_insert(acb, srb);
                dprintkl(KERN_DEBUG, "eh_abort: Command was waiting\n");
                cmd->result = DID_ABORT << 16;
                return SUCCESS;
        }
        srb = find_cmd(cmd, &dcb->srb_going_list);
        if (srb) {
                dprintkl(KERN_DEBUG, "eh_abort: Command in progress\n");
                /* XXX: Should abort the command here */
        } else {
                dprintkl(KERN_DEBUG, "eh_abort: Command not found\n");
        }
        return FAILED;
}


/* SDTR */
static void build_sdtr(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
                struct ScsiReqBlk *srb)
{
        u8 *ptr = srb->msgout_buf + srb->msg_count;
        if (srb->msg_count > 1) {
                dprintkl(KERN_INFO,
                        "build_sdtr: msgout_buf BUSY (%i: %02x %02x)\n",
                        srb->msg_count, srb->msgout_buf[0],
                        srb->msgout_buf[1]);
                return;
        }
        if (!(dcb->dev_mode & NTC_DO_SYNC_NEGO)) {
                dcb->sync_offset = 0;
                dcb->min_nego_period = 200 >> 2;
        } else if (dcb->sync_offset == 0)
                dcb->sync_offset = SYNC_NEGO_OFFSET;

        *ptr++ = MSG_EXTENDED;  /* (01h) */
        *ptr++ = 3;             /* length */
        *ptr++ = EXTENDED_SDTR; /* (01h) */
        *ptr++ = dcb->min_nego_period;  /* Transfer period (in 4ns) */
        *ptr++ = dcb->sync_offset;      /* Transfer period (max. REQ/ACK dist) */
        srb->msg_count += 5;
        srb->state |= SRB_DO_SYNC_NEGO;
}


/* WDTR */
static void build_wdtr(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
                struct ScsiReqBlk *srb)
{
        u8 wide = ((dcb->dev_mode & NTC_DO_WIDE_NEGO) &
                   (acb->config & HCC_WIDE_CARD)) ? 1 : 0;
        u8 *ptr = srb->msgout_buf + srb->msg_count;
        if (srb->msg_count > 1) {
                dprintkl(KERN_INFO,
                        "build_wdtr: msgout_buf BUSY (%i: %02x %02x)\n",
                        srb->msg_count, srb->msgout_buf[0],
                        srb->msgout_buf[1]);
                return;
        }
        *ptr++ = MSG_EXTENDED;  /* (01h) */
        *ptr++ = 2;             /* length */
        *ptr++ = EXTENDED_WDTR; /* (03h) */
        *ptr++ = wide;
        srb->msg_count += 4;
        srb->state |= SRB_DO_WIDE_NEGO;
}


#if 0
/* Timer to work around chip flaw: When selecting and the bus is 
 * busy, we sometimes miss a Selection timeout IRQ */
void selection_timeout_missed(unsigned long ptr);
/* Sets the timer to wake us up */
static void selto_timer(struct AdapterCtlBlk *acb)
{
        if (timer_pending(&acb->selto_timer))
                return;
        acb->selto_timer.function = selection_timeout_missed;
        acb->selto_timer.data = (unsigned long) acb;
        if (time_before
            (jiffies + HZ, acb->last_reset + HZ / 2))
                acb->selto_timer.expires =
                    acb->last_reset + HZ / 2 + 1;
        else
                acb->selto_timer.expires = jiffies + HZ + 1;
        add_timer(&acb->selto_timer);
}


void selection_timeout_missed(unsigned long ptr)
{
        unsigned long flags;
        struct AdapterCtlBlk *acb = (struct AdapterCtlBlk *)ptr;
        struct ScsiReqBlk *srb;
        dprintkl(KERN_DEBUG, "Chip forgot to produce SelTO IRQ!\n");
        if (!acb->active_dcb || !acb->active_dcb->active_srb) {
                dprintkl(KERN_DEBUG, "... but no cmd pending? Oops!\n");
                return;
        }
        DC395x_LOCK_IO(acb->scsi_host, flags);
        srb = acb->active_dcb->active_srb;
        disconnect(acb);
        DC395x_UNLOCK_IO(acb->scsi_host, flags);
}
#endif


static u8 start_scsi(struct AdapterCtlBlk* acb, struct DeviceCtlBlk* dcb,
                struct ScsiReqBlk* srb)
{
        u16 s_stat2, return_code;
        u8 s_stat, scsicommand, i, identify_message;
        u8 *ptr;
        dprintkdbg(DBG_0, "start_scsi: (0x%p) <%02i-%i> srb=%p\n",
                dcb->target_id, dcb->target_lun, srb);

        srb->tag_number = TAG_NONE;     /* acb->tag_max_num: had error read in eeprom */

        s_stat = DC395x_read8(acb, TRM_S1040_SCSI_SIGNAL);
        s_stat2 = 0;
        s_stat2 = DC395x_read16(acb, TRM_S1040_SCSI_STATUS);
#if 1
        if (s_stat & 0x20 /* s_stat2 & 0x02000 */ ) {
                dprintkdbg(DBG_KG, "start_scsi: (0x%p) BUSY %02x %04x\n",
                        s_stat, s_stat2);
                /*
                 * Try anyway?
                 *
                 * We could, BUT: Sometimes the TRM_S1040 misses to produce a Selection
                 * Timeout, a Disconnect or a Reselection IRQ, so we would be screwed!
                 * (This is likely to be a bug in the hardware. Obviously, most people
                 *  only have one initiator per SCSI bus.)
                 * Instead let this fail and have the timer make sure the command is 
                 * tried again after a short time
                 */
                /*selto_timer (acb); */
                return 1;
        }
#endif
        if (acb->active_dcb) {
                dprintkl(KERN_DEBUG, "start_scsi: (0x%p) Attempt to start a"
                        "command while another command (0x%p) is active.",
                        srb->cmd,
                        acb->active_dcb->active_srb ?
                            acb->active_dcb->active_srb->cmd : 0);
                return 1;
        }
        if (DC395x_read16(acb, TRM_S1040_SCSI_STATUS) & SCSIINTERRUPT) {
                dprintkdbg(DBG_KG, "start_scsi: (0x%p) Failed (busy)\n", srb->cmd);
                return 1;
        }
        /* Allow starting of SCSI commands half a second before we allow the mid-level
         * to queue them again after a reset */
        if (time_before(jiffies, acb->last_reset - HZ / 2)) {
                dprintkdbg(DBG_KG, "start_scsi: Refuse cmds (reset wait)\n");
                return 1;
        }

        /* Flush FIFO */
        clear_fifo(acb, "start_scsi");
        DC395x_write8(acb, TRM_S1040_SCSI_HOSTID, acb->scsi_host->this_id);
        DC395x_write8(acb, TRM_S1040_SCSI_TARGETID, dcb->target_id);
        DC395x_write8(acb, TRM_S1040_SCSI_SYNC, dcb->sync_period);
        DC395x_write8(acb, TRM_S1040_SCSI_OFFSET, dcb->sync_offset);
        srb->scsi_phase = PH_BUS_FREE;  /* initial phase */

        identify_message = dcb->identify_msg;
        /*DC395x_TRM_write8(TRM_S1040_SCSI_IDMSG, identify_message); */
        /* Don't allow disconnection for AUTO_REQSENSE: Cont.All.Cond.! */
        if (srb->flag & AUTO_REQSENSE)
                identify_message &= 0xBF;

        if (((srb->cmd->cmnd[0] == INQUIRY)
             || (srb->cmd->cmnd[0] == REQUEST_SENSE)
             || (srb->flag & AUTO_REQSENSE))
            && (((dcb->sync_mode & WIDE_NEGO_ENABLE)
                 && !(dcb->sync_mode & WIDE_NEGO_DONE))
                || ((dcb->sync_mode & SYNC_NEGO_ENABLE)
                    && !(dcb->sync_mode & SYNC_NEGO_DONE)))
            && (dcb->target_lun == 0)) {
                srb->msgout_buf[0] = identify_message;
                srb->msg_count = 1;
                scsicommand = SCMD_SEL_ATNSTOP;
                srb->state = SRB_MSGOUT;
#ifndef SYNC_FIRST
                if (dcb->sync_mode & WIDE_NEGO_ENABLE
                    && dcb->inquiry7 & SCSI_INQ_WBUS16) {
                        build_wdtr(acb, dcb, srb);
                        goto no_cmd;
                }
#endif
                if (dcb->sync_mode & SYNC_NEGO_ENABLE
                    && dcb->inquiry7 & SCSI_INQ_SYNC) {
                        build_sdtr(acb, dcb, srb);
                        goto no_cmd;
                }
                if (dcb->sync_mode & WIDE_NEGO_ENABLE
                    && dcb->inquiry7 & SCSI_INQ_WBUS16) {
                        build_wdtr(acb, dcb, srb);
                        goto no_cmd;
                }
                srb->msg_count = 0;
        }
        /* Send identify message */
        DC395x_write8(acb, TRM_S1040_SCSI_FIFO, identify_message);

        scsicommand = SCMD_SEL_ATN;
        srb->state = SRB_START_;
#ifndef DC395x_NO_TAGQ
        if ((dcb->sync_mode & EN_TAG_QUEUEING)
            && (identify_message & 0xC0)) {
                /* Send Tag message */
                u32 tag_mask = 1;
                u8 tag_number = 0;
                while (tag_mask & dcb->tag_mask
                       && tag_number < dcb->max_command) {
                        tag_mask = tag_mask << 1;
                        tag_number++;
                }
                if (tag_number >= dcb->max_command) {
                        dprintkl(KERN_WARNING, "start_scsi: (0x%p) "
                                "Out of tags target=<%02i-%i>)\n",
                                srb->cmd, srb->cmd->device->id,
                                (u8)srb->cmd->device->lun);
                        srb->state = SRB_READY;
                        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL,
                                       DO_HWRESELECT);
                        return 1;
                }
                /* Send Tag id */
                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, MSG_SIMPLE_QTAG);
                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, tag_number);
                dcb->tag_mask |= tag_mask;
                srb->tag_number = tag_number;
                scsicommand = SCMD_SEL_ATN3;
                srb->state = SRB_START_;
        }
#endif
/*polling:*/
        /* Send CDB ..command block ......... */
        dprintkdbg(DBG_KG, "start_scsi: (0x%p) <%02i-%i> cmnd=0x%02x tag=%i\n",
                srb->cmd, srb->cmd->device->id, (u8)srb->cmd->device->lun,
                srb->cmd->cmnd[0], srb->tag_number);
        if (srb->flag & AUTO_REQSENSE) {
                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, REQUEST_SENSE);
                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, (dcb->target_lun << 5));
                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 0);
                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 0);
                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, SCSI_SENSE_BUFFERSIZE);
                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 0);
        } else {
                ptr = (u8 *)srb->cmd->cmnd;
                for (i = 0; i < srb->cmd->cmd_len; i++)
                        DC395x_write8(acb, TRM_S1040_SCSI_FIFO, *ptr++);
        }
      no_cmd:
        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL,
                       DO_HWRESELECT | DO_DATALATCH);
        if (DC395x_read16(acb, TRM_S1040_SCSI_STATUS) & SCSIINTERRUPT) {
                /* 
                 * If start_scsi return 1:
                 * we caught an interrupt (must be reset or reselection ... )
                 * : Let's process it first!
                 */
                dprintkdbg(DBG_0, "start_scsi: (0x%p) <%02i-%i> Failed - busy\n",
                        srb->cmd, dcb->target_id, dcb->target_lun);
                srb->state = SRB_READY;
                free_tag(dcb, srb);
                srb->msg_count = 0;
                return_code = 1;
                /* This IRQ should NOT get lost, as we did not acknowledge it */
        } else {
                /* 
                 * If start_scsi returns 0:
                 * we know that the SCSI processor is free
                 */
                srb->scsi_phase = PH_BUS_FREE;  /* initial phase */
                dcb->active_srb = srb;
                acb->active_dcb = dcb;
                return_code = 0;
                /* it's important for atn stop */
                DC395x_write16(acb, TRM_S1040_SCSI_CONTROL,
                               DO_DATALATCH | DO_HWRESELECT);
                /* SCSI command */
                DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, scsicommand);
        }
        return return_code;
}


#define DC395x_ENABLE_MSGOUT \
 DC395x_write16 (acb, TRM_S1040_SCSI_CONTROL, DO_SETATN); \
 srb->state |= SRB_MSGOUT


/* abort command */
static inline void enable_msgout_abort(struct AdapterCtlBlk *acb,
                struct ScsiReqBlk *srb)
{
        srb->msgout_buf[0] = ABORT;
        srb->msg_count = 1;
        DC395x_ENABLE_MSGOUT;
        srb->state &= ~SRB_MSGIN;
        srb->state |= SRB_MSGOUT;
}


/**
 * dc395x_handle_interrupt - Handle an interrupt that has been confirmed to
 *                           have been triggered for this card.
 *
 * @acb:         a pointer to the adpter control block
 * @scsi_status: the status return when we checked the card
 **/
static void dc395x_handle_interrupt(struct AdapterCtlBlk *acb,
                u16 scsi_status)
{
        struct DeviceCtlBlk *dcb;
        struct ScsiReqBlk *srb;
        u16 phase;
        u8 scsi_intstatus;
        unsigned long flags;
        void (*dc395x_statev)(struct AdapterCtlBlk *, struct ScsiReqBlk *, 
                              u16 *);

        DC395x_LOCK_IO(acb->scsi_host, flags);

        /* This acknowledges the IRQ */
        scsi_intstatus = DC395x_read8(acb, TRM_S1040_SCSI_INTSTATUS);
        if ((scsi_status & 0x2007) == 0x2002)
                dprintkl(KERN_DEBUG,
                        "COP after COP completed? %04x\n", scsi_status);
        if (debug_enabled(DBG_KG)) {
                if (scsi_intstatus & INT_SELTIMEOUT)
                        dprintkdbg(DBG_KG, "handle_interrupt: Selection timeout\n");
        }
        /*dprintkl(KERN_DEBUG, "handle_interrupt: intstatus = 0x%02x ", scsi_intstatus); */

        if (timer_pending(&acb->selto_timer))
                del_timer(&acb->selto_timer);

        if (scsi_intstatus & (INT_SELTIMEOUT | INT_DISCONNECT)) {
                disconnect(acb);        /* bus free interrupt  */
                goto out_unlock;
        }
        if (scsi_intstatus & INT_RESELECTED) {
                reselect(acb);
                goto out_unlock;
        }
        if (scsi_intstatus & INT_SELECT) {
                dprintkl(KERN_INFO, "Host does not support target mode!\n");
                goto out_unlock;
        }
        if (scsi_intstatus & INT_SCSIRESET) {
                scsi_reset_detect(acb);
                goto out_unlock;
        }
        if (scsi_intstatus & (INT_BUSSERVICE | INT_CMDDONE)) {
                dcb = acb->active_dcb;
                if (!dcb) {
                        dprintkl(KERN_DEBUG,
                                "Oops: BusService (%04x %02x) w/o ActiveDCB!\n",
                                scsi_status, scsi_intstatus);
                        goto out_unlock;
                }
                srb = dcb->active_srb;
                if (dcb->flag & ABORT_DEV_) {
                        dprintkdbg(DBG_0, "MsgOut Abort Device.....\n");
                        enable_msgout_abort(acb, srb);
                }

                /* software sequential machine */
                phase = (u16)srb->scsi_phase;

                /* 
                 * 62037 or 62137
                 * call  dc395x_scsi_phase0[]... "phase entry"
                 * handle every phase before start transfer
                 */
                /* data_out_phase0,     phase:0 */
                /* data_in_phase0,      phase:1 */
                /* command_phase0,      phase:2 */
                /* status_phase0,       phase:3 */
                /* nop0,                phase:4 PH_BUS_FREE .. initial phase */
                /* nop0,                phase:5 PH_BUS_FREE .. initial phase */
                /* msgout_phase0,       phase:6 */
                /* msgin_phase0,        phase:7 */
                dc395x_statev = dc395x_scsi_phase0[phase];
                dc395x_statev(acb, srb, &scsi_status);

                /* 
                 * if there were any exception occurred scsi_status
                 * will be modify to bus free phase new scsi_status
                 * transfer out from ... previous dc395x_statev
                 */
                srb->scsi_phase = scsi_status & PHASEMASK;
                phase = (u16)scsi_status & PHASEMASK;

                /* 
                 * call  dc395x_scsi_phase1[]... "phase entry" handle
                 * every phase to do transfer
                 */
                /* data_out_phase1,     phase:0 */
                /* data_in_phase1,      phase:1 */
                /* command_phase1,      phase:2 */
                /* status_phase1,       phase:3 */
                /* nop1,                phase:4 PH_BUS_FREE .. initial phase */
                /* nop1,                phase:5 PH_BUS_FREE .. initial phase */
                /* msgout_phase1,       phase:6 */
                /* msgin_phase1,        phase:7 */
                dc395x_statev = dc395x_scsi_phase1[phase];
                dc395x_statev(acb, srb, &scsi_status);
        }
      out_unlock:
        DC395x_UNLOCK_IO(acb->scsi_host, flags);
}


static irqreturn_t dc395x_interrupt(int irq, void *dev_id)
{
        struct AdapterCtlBlk *acb = dev_id;
        u16 scsi_status;
        u8 dma_status;
        irqreturn_t handled = IRQ_NONE;

        /*
         * Check for pending interrupt
         */
        scsi_status = DC395x_read16(acb, TRM_S1040_SCSI_STATUS);
        dma_status = DC395x_read8(acb, TRM_S1040_DMA_STATUS);
        if (scsi_status & SCSIINTERRUPT) {
                /* interrupt pending - let's process it! */
                dc395x_handle_interrupt(acb, scsi_status);
                handled = IRQ_HANDLED;
        }
        else if (dma_status & 0x20) {
                /* Error from the DMA engine */
                dprintkl(KERN_INFO, "Interrupt from DMA engine: 0x%02x!\n", dma_status);
#if 0
                dprintkl(KERN_INFO, "This means DMA error! Try to handle ...\n");
                if (acb->active_dcb) {
                        acb->active_dcb-> flag |= ABORT_DEV_;
                        if (acb->active_dcb->active_srb)
                                enable_msgout_abort(acb, acb->active_dcb->active_srb);
                }
                DC395x_write8(acb, TRM_S1040_DMA_CONTROL, ABORTXFER | CLRXFIFO);
#else
                dprintkl(KERN_INFO, "Ignoring DMA error (probably a bad thing) ...\n");
                acb = NULL;
#endif
                handled = IRQ_HANDLED;
        }

        return handled;
}


static void msgout_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status)
{
        dprintkdbg(DBG_0, "msgout_phase0: (0x%p)\n", srb->cmd);
        if (srb->state & (SRB_UNEXPECT_RESEL + SRB_ABORT_SENT))
                *pscsi_status = PH_BUS_FREE;    /*.. initial phase */

        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);      /* it's important for atn stop */
        srb->state &= ~SRB_MSGOUT;
}


static void msgout_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status)
{
        u16 i;
        u8 *ptr;
        dprintkdbg(DBG_0, "msgout_phase1: (0x%p)\n", srb->cmd);

        clear_fifo(acb, "msgout_phase1");
        if (!(srb->state & SRB_MSGOUT)) {
                srb->state |= SRB_MSGOUT;
                dprintkl(KERN_DEBUG,
                        "msgout_phase1: (0x%p) Phase unexpected\n",
                        srb->cmd);      /* So what ? */
        }
        if (!srb->msg_count) {
                dprintkdbg(DBG_0, "msgout_phase1: (0x%p) NOP msg\n",
                        srb->cmd);
                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, MSG_NOP);
                DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);      /* it's important for atn stop */
                DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, SCMD_FIFO_OUT);
                return;
        }
        ptr = (u8 *)srb->msgout_buf;
        for (i = 0; i < srb->msg_count; i++)
                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, *ptr++);
        srb->msg_count = 0;
        if (srb->msgout_buf[0] == MSG_ABORT)
                srb->state = SRB_ABORT_SENT;

        DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, SCMD_FIFO_OUT);
}


static void command_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status)
{
        dprintkdbg(DBG_0, "command_phase0: (0x%p)\n", srb->cmd);
        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);
}


static void command_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status)
{
        struct DeviceCtlBlk *dcb;
        u8 *ptr;
        u16 i;
        dprintkdbg(DBG_0, "command_phase1: (0x%p)\n", srb->cmd);

        clear_fifo(acb, "command_phase1");
        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_CLRATN);
        if (!(srb->flag & AUTO_REQSENSE)) {
                ptr = (u8 *)srb->cmd->cmnd;
                for (i = 0; i < srb->cmd->cmd_len; i++) {
                        DC395x_write8(acb, TRM_S1040_SCSI_FIFO, *ptr);
                        ptr++;
                }
        } else {
                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, REQUEST_SENSE);
                dcb = acb->active_dcb;
                /* target id */
                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, (dcb->target_lun << 5));
                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 0);
                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 0);
                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, SCSI_SENSE_BUFFERSIZE);
                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 0);
        }
        srb->state |= SRB_COMMAND;
        /* it's important for atn stop */
        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);
        /* SCSI command */
        DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, SCMD_FIFO_OUT);
}


/*
 * Verify that the remaining space in the hw sg lists is the same as
 * the count of remaining bytes in srb->total_xfer_length
 */
static void sg_verify_length(struct ScsiReqBlk *srb)
{
        if (debug_enabled(DBG_SG)) {
                unsigned len = 0;
                unsigned idx = srb->sg_index;
                struct SGentry *psge = srb->segment_x + idx;
                for (; idx < srb->sg_count; psge++, idx++)
                        len += psge->length;
                if (len != srb->total_xfer_length)
                        dprintkdbg(DBG_SG,
                               "Inconsistent SRB S/G lengths (Tot=%i, Count=%i) !!\n",
                               srb->total_xfer_length, len);
        }                              
}


/*
 * Compute the next Scatter Gather list index and adjust its length
 * and address if necessary
 */
static void sg_update_list(struct ScsiReqBlk *srb, u32 left)
{
        u8 idx;
        u32 xferred = srb->total_xfer_length - left; /* bytes transferred */
        struct SGentry *psge = srb->segment_x + srb->sg_index;

        dprintkdbg(DBG_0,
                "sg_update_list: Transferred %i of %i bytes, %i remain\n",
                xferred, srb->total_xfer_length, left);
        if (xferred == 0) {
                /* nothing to update since we did not transfer any data */
                return;
        }

        sg_verify_length(srb);
        srb->total_xfer_length = left;  /* update remaining count */
        for (idx = srb->sg_index; idx < srb->sg_count; idx++) {
                if (xferred >= psge->length) {
                        /* Complete SG entries done */
                        xferred -= psge->length;
                } else {
                        /* Partial SG entry done */
                        psge->length -= xferred;
                        psge->address += xferred;
                        srb->sg_index = idx;
                        pci_dma_sync_single_for_device(srb->dcb->
                                            acb->dev,
                                            srb->sg_bus_addr,
                                            SEGMENTX_LEN,
                                            PCI_DMA_TODEVICE);
                        break;
                }
                psge++;
        }
        sg_verify_length(srb);
}


/*
 * We have transferred a single byte (PIO mode?) and need to update
 * the count of bytes remaining (total_xfer_length) and update the sg
 * entry to either point to next byte in the current sg entry, or of
 * already at the end to point to the start of the next sg entry
 */
static void sg_subtract_one(struct ScsiReqBlk *srb)
{
        sg_update_list(srb, srb->total_xfer_length - 1);
}


/* 
 * cleanup_after_transfer
 * 
 * Makes sure, DMA and SCSI engine are empty, after the transfer has finished
 * KG: Currently called from  StatusPhase1 ()
 * Should probably also be called from other places
 * Best might be to call it in DataXXPhase0, if new phase will differ 
 */
static void cleanup_after_transfer(struct AdapterCtlBlk *acb,
                struct ScsiReqBlk *srb)
{
        /*DC395x_write8 (TRM_S1040_DMA_STATUS, FORCEDMACOMP); */
        if (DC395x_read16(acb, TRM_S1040_DMA_COMMAND) & 0x0001) {       /* read */
                if (!(DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT) & 0x40))
                        clear_fifo(acb, "cleanup/in");
                if (!(DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT) & 0x80))
                        DC395x_write8(acb, TRM_S1040_DMA_CONTROL, CLRXFIFO);
        } else {                /* write */
                if (!(DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT) & 0x80))
                        DC395x_write8(acb, TRM_S1040_DMA_CONTROL, CLRXFIFO);
                if (!(DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT) & 0x40))
                        clear_fifo(acb, "cleanup/out");
        }
        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);
}


/*
 * Those no of bytes will be transferred w/ PIO through the SCSI FIFO
 * Seems to be needed for unknown reasons; could be a hardware bug :-(
 */
#define DC395x_LASTPIO 4


static void data_out_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status)
{
        struct DeviceCtlBlk *dcb = srb->dcb;
        u16 scsi_status = *pscsi_status;
        u32 d_left_counter = 0;
        dprintkdbg(DBG_0, "data_out_phase0: (0x%p) <%02i-%i>\n",
                srb->cmd, srb->cmd->device->id, (u8)srb->cmd->device->lun);

        /*
         * KG: We need to drain the buffers before we draw any conclusions!
         * This means telling the DMA to push the rest into SCSI, telling
         * SCSI to push the rest to the bus.
         * However, the device might have been the one to stop us (phase
         * change), and the data in transit just needs to be accounted so
         * it can be retransmitted.)
         */
        /* 
         * KG: Stop DMA engine pushing more data into the SCSI FIFO
         * If we need more data, the DMA SG list will be freshly set up, anyway
         */
        dprintkdbg(DBG_PIO, "data_out_phase0: "
                "DMA{fifocnt=0x%02x fifostat=0x%02x} "
                "SCSI{fifocnt=0x%02x cnt=0x%06x status=0x%04x} total=0x%06x\n",
                DC395x_read8(acb, TRM_S1040_DMA_FIFOCNT),
                DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT),
                DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT),
                DC395x_read32(acb, TRM_S1040_SCSI_COUNTER), scsi_status,
                srb->total_xfer_length);
        DC395x_write8(acb, TRM_S1040_DMA_CONTROL, STOPDMAXFER | CLRXFIFO);

        if (!(srb->state & SRB_XFERPAD)) {
                if (scsi_status & PARITYERROR)
                        srb->status |= PARITY_ERROR;

                /*
                 * KG: Right, we can't just rely on the SCSI_COUNTER, because this
                 * is the no of bytes it got from the DMA engine not the no it 
                 * transferred successfully to the device. (And the difference could
                 * be as much as the FIFO size, I guess ...)
                 */
                if (!(scsi_status & SCSIXFERDONE)) {
                        /*
                         * when data transfer from DMA FIFO to SCSI FIFO
                         * if there was some data left in SCSI FIFO
                         */
                        d_left_counter =
                            (u32)(DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT) &
                                  0x1F);
                        if (dcb->sync_period & WIDE_SYNC)
                                d_left_counter <<= 1;

                        dprintkdbg(DBG_KG, "data_out_phase0: FIFO contains %i %s\n"
                                "SCSI{fifocnt=0x%02x cnt=0x%08x} "
                                "DMA{fifocnt=0x%04x cnt=0x%02x ctr=0x%08x}\n",
                                DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT),
                                (dcb->sync_period & WIDE_SYNC) ? "words" : "bytes",
                                DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT),
                                DC395x_read32(acb, TRM_S1040_SCSI_COUNTER),
                                DC395x_read8(acb, TRM_S1040_DMA_FIFOCNT),
                                DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT),
                                DC395x_read32(acb, TRM_S1040_DMA_CXCNT));
                }
                /*
                 * calculate all the residue data that not yet tranfered
                 * SCSI transfer counter + left in SCSI FIFO data
                 *
                 * .....TRM_S1040_SCSI_COUNTER (24bits)
                 * The counter always decrement by one for every SCSI byte transfer.
                 * .....TRM_S1040_SCSI_FIFOCNT ( 5bits)
                 * The counter is SCSI FIFO offset counter (in units of bytes or! words)
                 */
                if (srb->total_xfer_length > DC395x_LASTPIO)
                        d_left_counter +=
                            DC395x_read32(acb, TRM_S1040_SCSI_COUNTER);

                /* Is this a good idea? */
                /*clear_fifo(acb, "DOP1"); */
                /* KG: What is this supposed to be useful for? WIDE padding stuff? */
                if (d_left_counter == 1 && dcb->sync_period & WIDE_SYNC
                    && scsi_bufflen(srb->cmd) % 2) {
                        d_left_counter = 0;
                        dprintkl(KERN_INFO,
                                "data_out_phase0: Discard 1 byte (0x%02x)\n",
                                scsi_status);
                }
                /*
                 * KG: Oops again. Same thinko as above: The SCSI might have been
                 * faster than the DMA engine, so that it ran out of data.
                 * In that case, we have to do just nothing! 
                 * But: Why the interrupt: No phase change. No XFERCNT_2_ZERO. Or?
                 */
                /*
                 * KG: This is nonsense: We have been WRITING data to the bus
                 * If the SCSI engine has no bytes left, how should the DMA engine?
                 */
                if (d_left_counter == 0) {
                        srb->total_xfer_length = 0;
                } else {
                        /*
                         * if transfer not yet complete
                         * there were some data residue in SCSI FIFO or
                         * SCSI transfer counter not empty
                         */
                        long oldxferred =
                            srb->total_xfer_length - d_left_counter;
                        const int diff =
                            (dcb->sync_period & WIDE_SYNC) ? 2 : 1;
                        sg_update_list(srb, d_left_counter);
                        /* KG: Most ugly hack! Apparently, this works around a chip bug */
                        if ((srb->segment_x[srb->sg_index].length ==
                             diff && scsi_sg_count(srb->cmd))
                            || ((oldxferred & ~PAGE_MASK) ==
                                (PAGE_SIZE - diff))
                            ) {
                                dprintkl(KERN_INFO, "data_out_phase0: "
                                        "Work around chip bug (%i)?\n", diff);
                                d_left_counter =
                                    srb->total_xfer_length - diff;
                                sg_update_list(srb, d_left_counter);
                                /*srb->total_xfer_length -= diff; */
                                /*srb->virt_addr += diff; */
                                /*if (srb->cmd->use_sg) */
                                /*      srb->sg_index++; */
                        }
                }
        }
        if ((*pscsi_status & PHASEMASK) != PH_DATA_OUT) {
                cleanup_after_transfer(acb, srb);
        }
}


static void data_out_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status)
{
        dprintkdbg(DBG_0, "data_out_phase1: (0x%p) <%02i-%i>\n",
                srb->cmd, srb->cmd->device->id, (u8)srb->cmd->device->lun);
        clear_fifo(acb, "data_out_phase1");
        /* do prepare before transfer when data out phase */
        data_io_transfer(acb, srb, XFERDATAOUT);
}

static void data_in_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status)
{
        u16 scsi_status = *pscsi_status;

        dprintkdbg(DBG_0, "data_in_phase0: (0x%p) <%02i-%i>\n",
                srb->cmd, srb->cmd->device->id, (u8)srb->cmd->device->lun);

        /*
         * KG: DataIn is much more tricky than DataOut. When the device is finished
         * and switches to another phase, the SCSI engine should be finished too.
         * But: There might still be bytes left in its FIFO to be fetched by the DMA
         * engine and transferred to memory.
         * We should wait for the FIFOs to be emptied by that (is there any way to 
         * enforce this?) and then stop the DMA engine, because it might think, that
         * there are more bytes to follow. Yes, the device might disconnect prior to
         * having all bytes transferred! 
         * Also we should make sure that all data from the DMA engine buffer's really
         * made its way to the system memory! Some documentation on this would not
         * seem to be a bad idea, actually.
         */
        if (!(srb->state & SRB_XFERPAD)) {
                u32 d_left_counter;
                unsigned int sc, fc;

                if (scsi_status & PARITYERROR) {
                        dprintkl(KERN_INFO, "data_in_phase0: (0x%p) "
                                "Parity Error\n", srb->cmd);
                        srb->status |= PARITY_ERROR;
                }
                /*
                 * KG: We should wait for the DMA FIFO to be empty ...
                 * but: it would be better to wait first for the SCSI FIFO and then the
                 * the DMA FIFO to become empty? How do we know, that the device not already
                 * sent data to the FIFO in a MsgIn phase, eg.?
                 */
                if (!(DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT) & 0x80)) {
#if 0
                        int ctr = 6000000;
                        dprintkl(KERN_DEBUG,
                                "DIP0: Wait for DMA FIFO to flush ...\n");
                        /*DC395x_write8  (TRM_S1040_DMA_CONTROL, STOPDMAXFER); */
                        /*DC395x_write32 (TRM_S1040_SCSI_COUNTER, 7); */
                        /*DC395x_write8  (TRM_S1040_SCSI_COMMAND, SCMD_DMA_IN); */
                        while (!
                               (DC395x_read16(acb, TRM_S1040_DMA_FIFOSTAT) &
                                0x80) && --ctr);
                        if (ctr < 6000000 - 1)
                                dprintkl(KERN_DEBUG
                                       "DIP0: Had to wait for DMA ...\n");
                        if (!ctr)
                                dprintkl(KERN_ERR,
                                       "Deadlock in DIP0 waiting for DMA FIFO empty!!\n");
                        /*DC395x_write32 (TRM_S1040_SCSI_COUNTER, 0); */
#endif
                        dprintkdbg(DBG_KG, "data_in_phase0: "
                                "DMA{fifocnt=0x%02x fifostat=0x%02x}\n",
                                DC395x_read8(acb, TRM_S1040_DMA_FIFOCNT),
                                DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT));
                }
                /* Now: Check remainig data: The SCSI counters should tell us ... */
                sc = DC395x_read32(acb, TRM_S1040_SCSI_COUNTER);
                fc = DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT);
                d_left_counter = sc + ((fc & 0x1f)
                       << ((srb->dcb->sync_period & WIDE_SYNC) ? 1 :
                           0));
                dprintkdbg(DBG_KG, "data_in_phase0: "
                        "SCSI{fifocnt=0x%02x%s ctr=0x%08x} "
                        "DMA{fifocnt=0x%02x fifostat=0x%02x ctr=0x%08x} "
                        "Remain{totxfer=%i scsi_fifo+ctr=%i}\n",
                        fc,
                        (srb->dcb->sync_period & WIDE_SYNC) ? "words" : "bytes",
                        sc,
                        fc,
                        DC395x_read8(acb, TRM_S1040_DMA_FIFOSTAT),
                        DC395x_read32(acb, TRM_S1040_DMA_CXCNT),
                        srb->total_xfer_length, d_left_counter);
#if DC395x_LASTPIO
                /* KG: Less than or equal to 4 bytes can not be transferred via DMA, it seems. */
                if (d_left_counter
                    && srb->total_xfer_length <= DC395x_LASTPIO) {
                        size_t left_io = srb->total_xfer_length;

                        /*u32 addr = (srb->segment_x[srb->sg_index].address); */
                        /*sg_update_list (srb, d_left_counter); */
                        dprintkdbg(DBG_PIO, "data_in_phase0: PIO (%i %s) "
                                   "for remaining %i bytes:",
                                fc & 0x1f,
                                (srb->dcb->sync_period & WIDE_SYNC) ?
                                    "words" : "bytes",
                                srb->total_xfer_length);
                        if (srb->dcb->sync_period & WIDE_SYNC)
                                DC395x_write8(acb, TRM_S1040_SCSI_CONFIG2,
                                              CFG2_WIDEFIFO);
                        while (left_io) {
                                unsigned char *virt, *base = NULL;
                                unsigned long flags = 0;
                                size_t len = left_io;
                                size_t offset = srb->request_length - left_io;

                                local_irq_save(flags);
                                /* Assumption: it's inside one page as it's at most 4 bytes and
                                   I just assume it's on a 4-byte boundary */
                                base = scsi_kmap_atomic_sg(scsi_sglist(srb->cmd),
                                                           srb->sg_count, &offset, &len);
                                virt = base + offset;

                                left_io -= len;

                                while (len) {
                                        u8 byte;
                                        byte = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
                                        *virt++ = byte;

                                        if (debug_enabled(DBG_PIO))
                                                printk(" %02x", byte);

                                        d_left_counter--;
                                        sg_subtract_one(srb);

                                        len--;

                                        fc = DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT);

                                        if (fc == 0x40) {
                                                left_io = 0;
                                                break;
                                        }
                                }

                                WARN_ON((fc != 0x40) == !d_left_counter);

                                if (fc == 0x40 && (srb->dcb->sync_period & WIDE_SYNC)) {
                                        /* Read the last byte ... */
                                        if (srb->total_xfer_length > 0) {
                                                u8 byte = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);

                                                *virt++ = byte;
                                                srb->total_xfer_length--;
                                                if (debug_enabled(DBG_PIO))
                                                        printk(" %02x", byte);
                                        }

                                        DC395x_write8(acb, TRM_S1040_SCSI_CONFIG2, 0);
                                }

                                scsi_kunmap_atomic_sg(base);
                                local_irq_restore(flags);
                        }
                        /*printk(" %08x", *(u32*)(bus_to_virt (addr))); */
                        /*srb->total_xfer_length = 0; */
                        if (debug_enabled(DBG_PIO))
                                printk("\n");
                }
#endif                          /* DC395x_LASTPIO */

#if 0
                /*
                 * KG: This was in DATAOUT. Does it also belong here?
                 * Nobody seems to know what counter and fifo_cnt count exactly ...
                 */
                if (!(scsi_status & SCSIXFERDONE)) {
                        /*
                         * when data transfer from DMA FIFO to SCSI FIFO
                         * if there was some data left in SCSI FIFO
                         */
                        d_left_counter =
                            (u32)(DC395x_read8(acb, TRM_S1040_SCSI_FIFOCNT) &
                                  0x1F);
                        if (srb->dcb->sync_period & WIDE_SYNC)
                                d_left_counter <<= 1;
                        /*
                         * if WIDE scsi SCSI FIFOCNT unit is word !!!
                         * so need to *= 2
                         * KG: Seems to be correct ...
                         */
                }
#endif
                /* KG: This should not be needed any more! */
                if (d_left_counter == 0
                    || (scsi_status & SCSIXFERCNT_2_ZERO)) {
#if 0
                        int ctr = 6000000;
                        u8 TempDMAstatus;
                        do {
                                TempDMAstatus =
                                    DC395x_read8(acb, TRM_S1040_DMA_STATUS);
                        } while (!(TempDMAstatus & DMAXFERCOMP) && --ctr);
                        if (!ctr)
                                dprintkl(KERN_ERR,
                                       "Deadlock in DataInPhase0 waiting for DMA!!\n");
                        srb->total_xfer_length = 0;
#endif
                        srb->total_xfer_length = d_left_counter;
                } else {        /* phase changed */
                        /*
                         * parsing the case:
                         * when a transfer not yet complete 
                         * but be disconnected by target
                         * if transfer not yet complete
                         * there were some data residue in SCSI FIFO or
                         * SCSI transfer counter not empty
                         */
                        sg_update_list(srb, d_left_counter);
                }
        }
        /* KG: The target may decide to disconnect: Empty FIFO before! */
        if ((*pscsi_status & PHASEMASK) != PH_DATA_IN) {
                cleanup_after_transfer(acb, srb);
        }
}


static void data_in_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status)
{
        dprintkdbg(DBG_0, "data_in_phase1: (0x%p) <%02i-%i>\n",
                srb->cmd, srb->cmd->device->id, (u8)srb->cmd->device->lun);
        data_io_transfer(acb, srb, XFERDATAIN);
}


static void data_io_transfer(struct AdapterCtlBlk *acb, 
                struct ScsiReqBlk *srb, u16 io_dir)
{
        struct DeviceCtlBlk *dcb = srb->dcb;
        u8 bval;
        dprintkdbg(DBG_0,
                "data_io_transfer: (0x%p) <%02i-%i> %c len=%i, sg=(%i/%i)\n",
                srb->cmd, srb->cmd->device->id, (u8)srb->cmd->device->lun,
                ((io_dir & DMACMD_DIR) ? 'r' : 'w'),
                srb->total_xfer_length, srb->sg_index, srb->sg_count);
        if (srb == acb->tmp_srb)
                dprintkl(KERN_ERR, "data_io_transfer: Using tmp_srb!\n");
        if (srb->sg_index >= srb->sg_count) {
                /* can't happen? out of bounds error */
                return;
        }

        if (srb->total_xfer_length > DC395x_LASTPIO) {
                u8 dma_status = DC395x_read8(acb, TRM_S1040_DMA_STATUS);
                /*
                 * KG: What should we do: Use SCSI Cmd 0x90/0x92?
                 * Maybe, even ABORTXFER would be appropriate
                 */
                if (dma_status & XFERPENDING) {
                        dprintkl(KERN_DEBUG, "data_io_transfer: Xfer pending! "
                                "Expect trouble!\n");
                        dump_register_info(acb, dcb, srb);
                        DC395x_write8(acb, TRM_S1040_DMA_CONTROL, CLRXFIFO);
                }
                /* clear_fifo(acb, "IO"); */
                /* 
                 * load what physical address of Scatter/Gather list table
                 * want to be transfer
                 */
                srb->state |= SRB_DATA_XFER;
                DC395x_write32(acb, TRM_S1040_DMA_XHIGHADDR, 0);
                if (scsi_sg_count(srb->cmd)) {  /* with S/G */
                        io_dir |= DMACMD_SG;
                        DC395x_write32(acb, TRM_S1040_DMA_XLOWADDR,
                                       srb->sg_bus_addr +
                                       sizeof(struct SGentry) *
                                       srb->sg_index);
                        /* load how many bytes in the sg list table */
                        DC395x_write32(acb, TRM_S1040_DMA_XCNT,
                                       ((u32)(srb->sg_count -
                                              srb->sg_index) << 3));
                } else {        /* without S/G */
                        io_dir &= ~DMACMD_SG;
                        DC395x_write32(acb, TRM_S1040_DMA_XLOWADDR,
                                       srb->segment_x[0].address);
                        DC395x_write32(acb, TRM_S1040_DMA_XCNT,
                                       srb->segment_x[0].length);
                }
                /* load total transfer length (24bits) max value 16Mbyte */
                DC395x_write32(acb, TRM_S1040_SCSI_COUNTER,
                               srb->total_xfer_length);
                DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);      /* it's important for atn stop */
                if (io_dir & DMACMD_DIR) {      /* read */
                        DC395x_write8(acb, TRM_S1040_SCSI_COMMAND,
                                      SCMD_DMA_IN);
                        DC395x_write16(acb, TRM_S1040_DMA_COMMAND, io_dir);
                } else {
                        DC395x_write16(acb, TRM_S1040_DMA_COMMAND, io_dir);
                        DC395x_write8(acb, TRM_S1040_SCSI_COMMAND,
                                      SCMD_DMA_OUT);
                }

        }
#if DC395x_LASTPIO
        else if (srb->total_xfer_length > 0) {  /* The last four bytes: Do PIO */
                /* 
                 * load what physical address of Scatter/Gather list table
                 * want to be transfer
                 */
                srb->state |= SRB_DATA_XFER;
                /* load total transfer length (24bits) max value 16Mbyte */
                DC395x_write32(acb, TRM_S1040_SCSI_COUNTER,
                               srb->total_xfer_length);
                DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);      /* it's important for atn stop */
                if (io_dir & DMACMD_DIR) {      /* read */
                        DC395x_write8(acb, TRM_S1040_SCSI_COMMAND,
                                      SCMD_FIFO_IN);
                } else {        /* write */
                        int ln = srb->total_xfer_length;
                        size_t left_io = srb->total_xfer_length;

                        if (srb->dcb->sync_period & WIDE_SYNC)
                                DC395x_write8(acb, TRM_S1040_SCSI_CONFIG2,
                                     CFG2_WIDEFIFO);

                        while (left_io) {
                                unsigned char *virt, *base = NULL;
                                unsigned long flags = 0;
                                size_t len = left_io;
                                size_t offset = srb->request_length - left_io;

                                local_irq_save(flags);
                                /* Again, max 4 bytes */
                                base = scsi_kmap_atomic_sg(scsi_sglist(srb->cmd),
                                                           srb->sg_count, &offset, &len);
                                virt = base + offset;

                                left_io -= len;

                                while (len--) {
                                        if (debug_enabled(DBG_PIO))
                                                printk(" %02x", *virt);

                                        DC395x_write8(acb, TRM_S1040_SCSI_FIFO, *virt++);

                                        sg_subtract_one(srb);
                                }

                                scsi_kunmap_atomic_sg(base);
                                local_irq_restore(flags);
                        }
                        if (srb->dcb->sync_period & WIDE_SYNC) {
                                if (ln % 2) {
                                        DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 0);
                                        if (debug_enabled(DBG_PIO))
                                                printk(" |00");
                                }
                                DC395x_write8(acb, TRM_S1040_SCSI_CONFIG2, 0);
                        }
                        /*DC395x_write32(acb, TRM_S1040_SCSI_COUNTER, ln); */
                        if (debug_enabled(DBG_PIO))
                                printk("\n");
                        DC395x_write8(acb, TRM_S1040_SCSI_COMMAND,
                                          SCMD_FIFO_OUT);
                }
        }
#endif                          /* DC395x_LASTPIO */
        else {          /* xfer pad */
                u8 data = 0, data2 = 0;
                if (srb->sg_count) {
                        srb->adapter_status = H_OVER_UNDER_RUN;
                        srb->status |= OVER_RUN;
                }
                /*
                 * KG: despite the fact that we are using 16 bits I/O ops
                 * the SCSI FIFO is only 8 bits according to the docs
                 * (we can set bit 1 in 0x8f to serialize FIFO access ...)
                 */
                if (dcb->sync_period & WIDE_SYNC) {
                        DC395x_write32(acb, TRM_S1040_SCSI_COUNTER, 2);
                        DC395x_write8(acb, TRM_S1040_SCSI_CONFIG2,
                                      CFG2_WIDEFIFO);
                        if (io_dir & DMACMD_DIR) {
                                data = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
                                data2 = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
                        } else {
                                /* Danger, Robinson: If you find KGs
                                 * scattered over the wide disk, the driver
                                 * or chip is to blame :-( */
                                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 'K');
                                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 'G');
                        }
                        DC395x_write8(acb, TRM_S1040_SCSI_CONFIG2, 0);
                } else {
                        DC395x_write32(acb, TRM_S1040_SCSI_COUNTER, 1);
                        /* Danger, Robinson: If you find a collection of Ks on your disk
                         * something broke :-( */
                        if (io_dir & DMACMD_DIR)
                                data = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
                        else
                                DC395x_write8(acb, TRM_S1040_SCSI_FIFO, 'K');
                }
                srb->state |= SRB_XFERPAD;
                DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);      /* it's important for atn stop */
                /* SCSI command */
                bval = (io_dir & DMACMD_DIR) ? SCMD_FIFO_IN : SCMD_FIFO_OUT;
                DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, bval);
        }
}


static void status_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status)
{
        dprintkdbg(DBG_0, "status_phase0: (0x%p) <%02i-%i>\n",
                srb->cmd, srb->cmd->device->id, (u8)srb->cmd->device->lun);
        srb->target_status = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
        srb->end_message = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);      /* get message */
        srb->state = SRB_COMPLETED;
        *pscsi_status = PH_BUS_FREE;    /*.. initial phase */
        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);      /* it's important for atn stop */
        DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, SCMD_MSGACCEPT);
}


static void status_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status)
{
        dprintkdbg(DBG_0, "status_phase1: (0x%p) <%02i-%i>\n",
                srb->cmd, srb->cmd->device->id, (u8)srb->cmd->device->lun);
        srb->state = SRB_STATUS;
        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);      /* it's important for atn stop */
        DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, SCMD_COMP);
}


/* Check if the message is complete */
static inline u8 msgin_completed(u8 * msgbuf, u32 len)
{
        if (*msgbuf == EXTENDED_MESSAGE) {
                if (len < 2)
                        return 0;
                if (len < msgbuf[1] + 2)
                        return 0;
        } else if (*msgbuf >= 0x20 && *msgbuf <= 0x2f)  /* two byte messages */
                if (len < 2)
                        return 0;
        return 1;
}

/* reject_msg */
static inline void msgin_reject(struct AdapterCtlBlk *acb,
                struct ScsiReqBlk *srb)
{
        srb->msgout_buf[0] = MESSAGE_REJECT;
        srb->msg_count = 1;
        DC395x_ENABLE_MSGOUT;
        srb->state &= ~SRB_MSGIN;
        srb->state |= SRB_MSGOUT;
        dprintkl(KERN_INFO, "msgin_reject: 0x%02x <%02i-%i>\n",
                srb->msgin_buf[0],
                srb->dcb->target_id, srb->dcb->target_lun);
}


static struct ScsiReqBlk *msgin_qtag(struct AdapterCtlBlk *acb,
                struct DeviceCtlBlk *dcb, u8 tag)
{
        struct ScsiReqBlk *srb = NULL;
        struct ScsiReqBlk *i;
        dprintkdbg(DBG_0, "msgin_qtag: (0x%p) tag=%i srb=%p\n",
                   srb->cmd, tag, srb);

        if (!(dcb->tag_mask & (1 << tag)))
                dprintkl(KERN_DEBUG,
                        "msgin_qtag: tag_mask=0x%08x does not reserve tag %i!\n",
                        dcb->tag_mask, tag);

        if (list_empty(&dcb->srb_going_list))
                goto mingx0;
        list_for_each_entry(i, &dcb->srb_going_list, list) {
                if (i->tag_number == tag) {
                        srb = i;
                        break;
                }
        }
        if (!srb)
                goto mingx0;

        dprintkdbg(DBG_0, "msgin_qtag: (0x%p) <%02i-%i>\n",
                srb->cmd, srb->dcb->target_id, srb->dcb->target_lun);
        if (dcb->flag & ABORT_DEV_) {
                /*srb->state = SRB_ABORT_SENT; */
                enable_msgout_abort(acb, srb);
        }

        if (!(srb->state & SRB_DISCONNECT))
                goto mingx0;

        memcpy(srb->msgin_buf, dcb->active_srb->msgin_buf, acb->msg_len);
        srb->state |= dcb->active_srb->state;
        srb->state |= SRB_DATA_XFER;
        dcb->active_srb = srb;
        /* How can we make the DORS happy? */
        return srb;

      mingx0:
        srb = acb->tmp_srb;
        srb->state = SRB_UNEXPECT_RESEL;
        dcb->active_srb = srb;
        srb->msgout_buf[0] = MSG_ABORT_TAG;
        srb->msg_count = 1;
        DC395x_ENABLE_MSGOUT;
        dprintkl(KERN_DEBUG, "msgin_qtag: Unknown tag %i - abort\n", tag);
        return srb;
}


static inline void reprogram_regs(struct AdapterCtlBlk *acb,
                struct DeviceCtlBlk *dcb)
{
        DC395x_write8(acb, TRM_S1040_SCSI_TARGETID, dcb->target_id);
        DC395x_write8(acb, TRM_S1040_SCSI_SYNC, dcb->sync_period);
        DC395x_write8(acb, TRM_S1040_SCSI_OFFSET, dcb->sync_offset);
        set_xfer_rate(acb, dcb);
}


/* set async transfer mode */
static void msgin_set_async(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
{
        struct DeviceCtlBlk *dcb = srb->dcb;
        dprintkl(KERN_DEBUG, "msgin_set_async: No sync transfers <%02i-%i>\n",
                dcb->target_id, dcb->target_lun);

        dcb->sync_mode &= ~(SYNC_NEGO_ENABLE);
        dcb->sync_mode |= SYNC_NEGO_DONE;
        /*dcb->sync_period &= 0; */
        dcb->sync_offset = 0;
        dcb->min_nego_period = 200 >> 2;        /* 200ns <=> 5 MHz */
        srb->state &= ~SRB_DO_SYNC_NEGO;
        reprogram_regs(acb, dcb);
        if ((dcb->sync_mode & WIDE_NEGO_ENABLE)
            && !(dcb->sync_mode & WIDE_NEGO_DONE)) {
                build_wdtr(acb, dcb, srb);
                DC395x_ENABLE_MSGOUT;
                dprintkdbg(DBG_0, "msgin_set_async(rej): Try WDTR anyway\n");
        }
}


/* set sync transfer mode */
static void msgin_set_sync(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
{
        struct DeviceCtlBlk *dcb = srb->dcb;
        u8 bval;
        int fact;
        dprintkdbg(DBG_1, "msgin_set_sync: <%02i> Sync: %ins "
                "(%02i.%01i MHz) Offset %i\n",
                dcb->target_id, srb->msgin_buf[3] << 2,
                (250 / srb->msgin_buf[3]),
                ((250 % srb->msgin_buf[3]) * 10) / srb->msgin_buf[3],
                srb->msgin_buf[4]);

        if (srb->msgin_buf[4] > 15)
                srb->msgin_buf[4] = 15;
        if (!(dcb->dev_mode & NTC_DO_SYNC_NEGO))
                dcb->sync_offset = 0;
        else if (dcb->sync_offset == 0)
                dcb->sync_offset = srb->msgin_buf[4];
        if (srb->msgin_buf[4] > dcb->sync_offset)
                srb->msgin_buf[4] = dcb->sync_offset;
        else
                dcb->sync_offset = srb->msgin_buf[4];
        bval = 0;
        while (bval < 7 && (srb->msgin_buf[3] > clock_period[bval]
                            || dcb->min_nego_period >
                            clock_period[bval]))
                bval++;
        if (srb->msgin_buf[3] < clock_period[bval])
                dprintkl(KERN_INFO,
                        "msgin_set_sync: Increase sync nego period to %ins\n",
                        clock_period[bval] << 2);
        srb->msgin_buf[3] = clock_period[bval];
        dcb->sync_period &= 0xf0;
        dcb->sync_period |= ALT_SYNC | bval;
        dcb->min_nego_period = srb->msgin_buf[3];

        if (dcb->sync_period & WIDE_SYNC)
                fact = 500;
        else
                fact = 250;

        dprintkl(KERN_INFO,
                "Target %02i: %s Sync: %ins Offset %i (%02i.%01i MB/s)\n",
                dcb->target_id, (fact == 500) ? "Wide16" : "",
                dcb->min_nego_period << 2, dcb->sync_offset,
                (fact / dcb->min_nego_period),
                ((fact % dcb->min_nego_period) * 10 +
                dcb->min_nego_period / 2) / dcb->min_nego_period);

        if (!(srb->state & SRB_DO_SYNC_NEGO)) {
                /* Reply with corrected SDTR Message */
                dprintkl(KERN_DEBUG, "msgin_set_sync: answer w/%ins %i\n",
                        srb->msgin_buf[3] << 2, srb->msgin_buf[4]);

                memcpy(srb->msgout_buf, srb->msgin_buf, 5);
                srb->msg_count = 5;
                DC395x_ENABLE_MSGOUT;
                dcb->sync_mode |= SYNC_NEGO_DONE;
        } else {
                if ((dcb->sync_mode & WIDE_NEGO_ENABLE)
                    && !(dcb->sync_mode & WIDE_NEGO_DONE)) {
                        build_wdtr(acb, dcb, srb);
                        DC395x_ENABLE_MSGOUT;
                        dprintkdbg(DBG_0, "msgin_set_sync: Also try WDTR\n");
                }
        }
        srb->state &= ~SRB_DO_SYNC_NEGO;
        dcb->sync_mode |= SYNC_NEGO_DONE | SYNC_NEGO_ENABLE;

        reprogram_regs(acb, dcb);
}


static inline void msgin_set_nowide(struct AdapterCtlBlk *acb,
                struct ScsiReqBlk *srb)
{
        struct DeviceCtlBlk *dcb = srb->dcb;
        dprintkdbg(DBG_1, "msgin_set_nowide: <%02i>\n", dcb->target_id);

        dcb->sync_period &= ~WIDE_SYNC;
        dcb->sync_mode &= ~(WIDE_NEGO_ENABLE);
        dcb->sync_mode |= WIDE_NEGO_DONE;
        srb->state &= ~SRB_DO_WIDE_NEGO;
        reprogram_regs(acb, dcb);
        if ((dcb->sync_mode & SYNC_NEGO_ENABLE)
            && !(dcb->sync_mode & SYNC_NEGO_DONE)) {
                build_sdtr(acb, dcb, srb);
                DC395x_ENABLE_MSGOUT;
                dprintkdbg(DBG_0, "msgin_set_nowide: Rejected. Try SDTR anyway\n");
        }
}

static void msgin_set_wide(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
{
        struct DeviceCtlBlk *dcb = srb->dcb;
        u8 wide = (dcb->dev_mode & NTC_DO_WIDE_NEGO
                   && acb->config & HCC_WIDE_CARD) ? 1 : 0;
        dprintkdbg(DBG_1, "msgin_set_wide: <%02i>\n", dcb->target_id);

        if (srb->msgin_buf[3] > wide)
                srb->msgin_buf[3] = wide;
        /* Completed */
        if (!(srb->state & SRB_DO_WIDE_NEGO)) {
                dprintkl(KERN_DEBUG,
                        "msgin_set_wide: Wide nego initiated <%02i>\n",
                        dcb->target_id);
                memcpy(srb->msgout_buf, srb->msgin_buf, 4);
                srb->msg_count = 4;
                srb->state |= SRB_DO_WIDE_NEGO;
                DC395x_ENABLE_MSGOUT;
        }

        dcb->sync_mode |= (WIDE_NEGO_ENABLE | WIDE_NEGO_DONE);
        if (srb->msgin_buf[3] > 0)
                dcb->sync_period |= WIDE_SYNC;
        else
                dcb->sync_period &= ~WIDE_SYNC;
        srb->state &= ~SRB_DO_WIDE_NEGO;
        /*dcb->sync_mode &= ~(WIDE_NEGO_ENABLE+WIDE_NEGO_DONE); */
        dprintkdbg(DBG_1,
                "msgin_set_wide: Wide (%i bit) negotiated <%02i>\n",
                (8 << srb->msgin_buf[3]), dcb->target_id);
        reprogram_regs(acb, dcb);
        if ((dcb->sync_mode & SYNC_NEGO_ENABLE)
            && !(dcb->sync_mode & SYNC_NEGO_DONE)) {
                build_sdtr(acb, dcb, srb);
                DC395x_ENABLE_MSGOUT;
                dprintkdbg(DBG_0, "msgin_set_wide: Also try SDTR.\n");
        }
}


/*
 * extended message codes:
 *
 *      code    description
 *
 *      02h     Reserved
 *      00h     MODIFY DATA  POINTER
 *      01h     SYNCHRONOUS DATA TRANSFER REQUEST
 *      03h     WIDE DATA TRANSFER REQUEST
 *   04h - 7Fh  Reserved
 *   80h - FFh  Vendor specific
 */
static void msgin_phase0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status)
{
        struct DeviceCtlBlk *dcb = acb->active_dcb;
        dprintkdbg(DBG_0, "msgin_phase0: (0x%p)\n", srb->cmd);

        srb->msgin_buf[acb->msg_len++] = DC395x_read8(acb, TRM_S1040_SCSI_FIFO);
        if (msgin_completed(srb->msgin_buf, acb->msg_len)) {
                /* Now eval the msg */
                switch (srb->msgin_buf[0]) {
                case DISCONNECT:
                        srb->state = SRB_DISCONNECT;
                        break;

                case SIMPLE_QUEUE_TAG:
                case HEAD_OF_QUEUE_TAG:
                case ORDERED_QUEUE_TAG:
                        srb =
                            msgin_qtag(acb, dcb,
                                              srb->msgin_buf[1]);
                        break;

                case MESSAGE_REJECT:
                        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL,
                                       DO_CLRATN | DO_DATALATCH);
                        /* A sync nego message was rejected ! */
                        if (srb->state & SRB_DO_SYNC_NEGO) {
                                msgin_set_async(acb, srb);
                                break;
                        }
                        /* A wide nego message was rejected ! */
                        if (srb->state & SRB_DO_WIDE_NEGO) {
                                msgin_set_nowide(acb, srb);
                                break;
                        }
                        enable_msgout_abort(acb, srb);
                        /*srb->state |= SRB_ABORT_SENT */
                        break;

                case EXTENDED_MESSAGE:
                        /* SDTR */
                        if (srb->msgin_buf[1] == 3
                            && srb->msgin_buf[2] == EXTENDED_SDTR) {
                                msgin_set_sync(acb, srb);
                                break;
                        }
                        /* WDTR */
                        if (srb->msgin_buf[1] == 2
                            && srb->msgin_buf[2] == EXTENDED_WDTR
                            && srb->msgin_buf[3] <= 2) { /* sanity check ... */
                                msgin_set_wide(acb, srb);
                                break;
                        }
                        msgin_reject(acb, srb);
                        break;

                case MSG_IGNOREWIDE:
                        /* Discard  wide residual */
                        dprintkdbg(DBG_0, "msgin_phase0: Ignore Wide Residual!\n");
                        break;

                case COMMAND_COMPLETE:
                        /* nothing has to be done */
                        break;

                case SAVE_POINTERS:
                        /*
                         * SAVE POINTER may be ignored as we have the struct
                         * ScsiReqBlk* associated with the scsi command.
                         */
                        dprintkdbg(DBG_0, "msgin_phase0: (0x%p) "
                                "SAVE POINTER rem=%i Ignore\n",
                                srb->cmd, srb->total_xfer_length);
                        break;

                case RESTORE_POINTERS:
                        dprintkdbg(DBG_0, "msgin_phase0: RESTORE POINTER. Ignore\n");
                        break;

                case ABORT:
                        dprintkdbg(DBG_0, "msgin_phase0: (0x%p) "
                                "<%02i-%i> ABORT msg\n",
                                srb->cmd, dcb->target_id,
                                dcb->target_lun);
                        dcb->flag |= ABORT_DEV_;
                        enable_msgout_abort(acb, srb);
                        break;

                default:
                        /* reject unknown messages */
                        if (srb->msgin_buf[0] & IDENTIFY_BASE) {
                                dprintkdbg(DBG_0, "msgin_phase0: Identify msg\n");
                                srb->msg_count = 1;
                                srb->msgout_buf[0] = dcb->identify_msg;
                                DC395x_ENABLE_MSGOUT;
                                srb->state |= SRB_MSGOUT;
                                /*break; */
                        }
                        msgin_reject(acb, srb);
                }

                /* Clear counter and MsgIn state */
                srb->state &= ~SRB_MSGIN;
                acb->msg_len = 0;
        }
        *pscsi_status = PH_BUS_FREE;
        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);      /* it's important ... you know! */
        DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, SCMD_MSGACCEPT);
}


static void msgin_phase1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status)
{
        dprintkdbg(DBG_0, "msgin_phase1: (0x%p)\n", srb->cmd);
        clear_fifo(acb, "msgin_phase1");
        DC395x_write32(acb, TRM_S1040_SCSI_COUNTER, 1);
        if (!(srb->state & SRB_MSGIN)) {
                srb->state &= ~SRB_DISCONNECT;
                srb->state |= SRB_MSGIN;
        }
        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);      /* it's important for atn stop */
        /* SCSI command */
        DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, SCMD_FIFO_IN);
}


static void nop0(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status)
{
}


static void nop1(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb,
                u16 *pscsi_status)
{
}


static void set_xfer_rate(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb)
{
        struct DeviceCtlBlk *i;

        /* set all lun device's  period, offset */
        if (dcb->identify_msg & 0x07)
                return;

        if (acb->scan_devices) {
                current_sync_offset = dcb->sync_offset;
                return;
        }

        list_for_each_entry(i, &acb->dcb_list, list)
                if (i->target_id == dcb->target_id) {
                        i->sync_period = dcb->sync_period;
                        i->sync_offset = dcb->sync_offset;
                        i->sync_mode = dcb->sync_mode;
                        i->min_nego_period = dcb->min_nego_period;
                }
}


static void disconnect(struct AdapterCtlBlk *acb)
{
        struct DeviceCtlBlk *dcb = acb->active_dcb;
        struct ScsiReqBlk *srb;

        if (!dcb) {
                dprintkl(KERN_ERR, "disconnect: No such device\n");
                udelay(500);
                /* Suspend queue for a while */
                acb->last_reset =
                    jiffies + HZ / 2 +
                    HZ * acb->eeprom.delay_time;
                clear_fifo(acb, "disconnectEx");
                DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_HWRESELECT);
                return;
        }
        srb = dcb->active_srb;
        acb->active_dcb = NULL;
        dprintkdbg(DBG_0, "disconnect: (0x%p)\n", srb->cmd);

        srb->scsi_phase = PH_BUS_FREE;  /* initial phase */
        clear_fifo(acb, "disconnect");
        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_HWRESELECT);
        if (srb->state & SRB_UNEXPECT_RESEL) {
                dprintkl(KERN_ERR,
                        "disconnect: Unexpected reselection <%02i-%i>\n",
                        dcb->target_id, dcb->target_lun);
                srb->state = 0;
                waiting_process_next(acb);
        } else if (srb->state & SRB_ABORT_SENT) {
                dcb->flag &= ~ABORT_DEV_;
                acb->last_reset = jiffies + HZ / 2 + 1;
                dprintkl(KERN_ERR, "disconnect: SRB_ABORT_SENT\n");
                doing_srb_done(acb, DID_ABORT, srb->cmd, 1);
                waiting_process_next(acb);
        } else {
                if ((srb->state & (SRB_START_ + SRB_MSGOUT))
                    || !(srb->
                         state & (SRB_DISCONNECT + SRB_COMPLETED))) {
                        /*
                         * Selection time out 
                         * SRB_START_ || SRB_MSGOUT || (!SRB_DISCONNECT && !SRB_COMPLETED)
                         */
                        /* Unexp. Disc / Sel Timeout */
                        if (srb->state != SRB_START_
                            && srb->state != SRB_MSGOUT) {
                                srb->state = SRB_READY;
                                dprintkl(KERN_DEBUG,
                                        "disconnect: (0x%p) Unexpected\n",
                                        srb->cmd);
                                srb->target_status = SCSI_STAT_SEL_TIMEOUT;
                                goto disc1;
                        } else {
                                /* Normal selection timeout */
                                dprintkdbg(DBG_KG, "disconnect: (0x%p) "
                                        "<%02i-%i> SelTO\n", srb->cmd,
                                        dcb->target_id, dcb->target_lun);
                                if (srb->retry_count++ > DC395x_MAX_RETRIES
                                    || acb->scan_devices) {
                                        srb->target_status =
                                            SCSI_STAT_SEL_TIMEOUT;
                                        goto disc1;
                                }
                                free_tag(dcb, srb);
                                srb_going_to_waiting_move(dcb, srb);
                                dprintkdbg(DBG_KG,
                                        "disconnect: (0x%p) Retry\n",
                                        srb->cmd);
                                waiting_set_timer(acb, HZ / 20);
                        }
                } else if (srb->state & SRB_DISCONNECT) {
                        u8 bval = DC395x_read8(acb, TRM_S1040_SCSI_SIGNAL);
                        /*
                         * SRB_DISCONNECT (This is what we expect!)
                         */
                        if (bval & 0x40) {
                                dprintkdbg(DBG_0, "disconnect: SCSI bus stat "
                                        " 0x%02x: ACK set! Other controllers?\n",
                                        bval);
                                /* It could come from another initiator, therefore don't do much ! */
                        } else
                                waiting_process_next(acb);
                } else if (srb->state & SRB_COMPLETED) {
                      disc1:
                        /*
                         ** SRB_COMPLETED
                         */
                        free_tag(dcb, srb);
                        dcb->active_srb = NULL;
                        srb->state = SRB_FREE;
                        srb_done(acb, dcb, srb);
                }
        }
}


static void reselect(struct AdapterCtlBlk *acb)
{
        struct DeviceCtlBlk *dcb = acb->active_dcb;
        struct ScsiReqBlk *srb = NULL;
        u16 rsel_tar_lun_id;
        u8 id, lun;
        u8 arblostflag = 0;
        dprintkdbg(DBG_0, "reselect: acb=%p\n", acb);

        clear_fifo(acb, "reselect");
        /*DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_HWRESELECT | DO_DATALATCH); */
        /* Read Reselected Target ID and LUN */
        rsel_tar_lun_id = DC395x_read16(acb, TRM_S1040_SCSI_TARGETID);
        if (dcb) {              /* Arbitration lost but Reselection win */
                srb = dcb->active_srb;
                if (!srb) {
                        dprintkl(KERN_DEBUG, "reselect: Arb lost Resel won, "
                                "but active_srb == NULL\n");
                        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);      /* it's important for atn stop */
                        return;
                }
                /* Why the if ? */
                if (!acb->scan_devices) {
                        dprintkdbg(DBG_KG, "reselect: (0x%p) <%02i-%i> "
                                "Arb lost but Resel win rsel=%i stat=0x%04x\n",
                                srb->cmd, dcb->target_id,
                                dcb->target_lun, rsel_tar_lun_id,
                                DC395x_read16(acb, TRM_S1040_SCSI_STATUS));
                        arblostflag = 1;
                        /*srb->state |= SRB_DISCONNECT; */

                        srb->state = SRB_READY;
                        free_tag(dcb, srb);
                        srb_going_to_waiting_move(dcb, srb);
                        waiting_set_timer(acb, HZ / 20);

                        /* return; */
                }
        }
        /* Read Reselected Target Id and LUN */
        if (!(rsel_tar_lun_id & (IDENTIFY_BASE << 8)))
                dprintkl(KERN_DEBUG, "reselect: Expects identify msg. "
                        "Got %i!\n", rsel_tar_lun_id);
        id = rsel_tar_lun_id & 0xff;
        lun = (rsel_tar_lun_id >> 8) & 7;
        dcb = find_dcb(acb, id, lun);
        if (!dcb) {
                dprintkl(KERN_ERR, "reselect: From non existent device "
                        "<%02i-%i>\n", id, lun);
                DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);      /* it's important for atn stop */
                return;
        }
        acb->active_dcb = dcb;

        if (!(dcb->dev_mode & NTC_DO_DISCONNECT))
                dprintkl(KERN_DEBUG, "reselect: in spite of forbidden "
                        "disconnection? <%02i-%i>\n",
                        dcb->target_id, dcb->target_lun);

        if (dcb->sync_mode & EN_TAG_QUEUEING /*&& !arblostflag */) {
                srb = acb->tmp_srb;
                dcb->active_srb = srb;
        } else {
                /* There can be only one! */
                srb = dcb->active_srb;
                if (!srb || !(srb->state & SRB_DISCONNECT)) {
                        /*
                         * abort command
                         */
                        dprintkl(KERN_DEBUG,
                                "reselect: w/o disconnected cmds <%02i-%i>\n",
                                dcb->target_id, dcb->target_lun);
                        srb = acb->tmp_srb;
                        srb->state = SRB_UNEXPECT_RESEL;
                        dcb->active_srb = srb;
                        enable_msgout_abort(acb, srb);
                } else {
                        if (dcb->flag & ABORT_DEV_) {
                                /*srb->state = SRB_ABORT_SENT; */
                                enable_msgout_abort(acb, srb);
                        } else
                                srb->state = SRB_DATA_XFER;

                }
        }
        srb->scsi_phase = PH_BUS_FREE;  /* initial phase */

        /* Program HA ID, target ID, period and offset */
        dprintkdbg(DBG_0, "reselect: select <%i>\n", dcb->target_id);
        DC395x_write8(acb, TRM_S1040_SCSI_HOSTID, acb->scsi_host->this_id);     /* host   ID */
        DC395x_write8(acb, TRM_S1040_SCSI_TARGETID, dcb->target_id);            /* target ID */
        DC395x_write8(acb, TRM_S1040_SCSI_OFFSET, dcb->sync_offset);            /* offset    */
        DC395x_write8(acb, TRM_S1040_SCSI_SYNC, dcb->sync_period);              /* sync period, wide */
        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_DATALATCH);              /* it's important for atn stop */
        /* SCSI command */
        DC395x_write8(acb, TRM_S1040_SCSI_COMMAND, SCMD_MSGACCEPT);
}


static inline u8 tagq_blacklist(char *name)
{
#ifndef DC395x_NO_TAGQ
#if 0
        u8 i;
        for (i = 0; i < BADDEVCNT; i++)
                if (memcmp(name, DC395x_baddevname1[i], 28) == 0)
                        return 1;
#endif
        return 0;
#else
        return 1;
#endif
}


static void disc_tagq_set(struct DeviceCtlBlk *dcb, struct ScsiInqData *ptr)
{
        /* Check for SCSI format (ANSI and Response data format) */
        if ((ptr->Vers & 0x07) >= 2 || (ptr->RDF & 0x0F) == 2) {
                if ((ptr->Flags & SCSI_INQ_CMDQUEUE)
                    && (dcb->dev_mode & NTC_DO_TAG_QUEUEING) &&
                    /*(dcb->dev_mode & NTC_DO_DISCONNECT) */
                    /* ((dcb->dev_type == TYPE_DISK) 
                       || (dcb->dev_type == TYPE_MOD)) && */
                    !tagq_blacklist(((char *)ptr) + 8)) {
                        if (dcb->max_command == 1)
                                dcb->max_command =
                                    dcb->acb->tag_max_num;
                        dcb->sync_mode |= EN_TAG_QUEUEING;
                        /*dcb->tag_mask = 0; */
                } else
                        dcb->max_command = 1;
        }
}


static void add_dev(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
                struct ScsiInqData *ptr)
{
        u8 bval1 = ptr->DevType & SCSI_DEVTYPE;
        dcb->dev_type = bval1;
        /* if (bval1 == TYPE_DISK || bval1 == TYPE_MOD) */
        disc_tagq_set(dcb, ptr);
}


/* unmap mapped pci regions from SRB */
static void pci_unmap_srb(struct AdapterCtlBlk *acb, struct ScsiReqBlk *srb)
{
        struct scsi_cmnd *cmd = srb->cmd;
        enum dma_data_direction dir = cmd->sc_data_direction;

        if (scsi_sg_count(cmd) && dir != PCI_DMA_NONE) {
                /* unmap DC395x SG list */
                dprintkdbg(DBG_SG, "pci_unmap_srb: list=%08x(%05x)\n",
                        srb->sg_bus_addr, SEGMENTX_LEN);
                pci_unmap_single(acb->dev, srb->sg_bus_addr,
                                 SEGMENTX_LEN,
                                 PCI_DMA_TODEVICE);
                dprintkdbg(DBG_SG, "pci_unmap_srb: segs=%i buffer=%p\n",
                           scsi_sg_count(cmd), scsi_bufflen(cmd));
                /* unmap the sg segments */
                scsi_dma_unmap(cmd);
        }
}


/* unmap mapped pci sense buffer from SRB */
static void pci_unmap_srb_sense(struct AdapterCtlBlk *acb,
                struct ScsiReqBlk *srb)
{
        if (!(srb->flag & AUTO_REQSENSE))
                return;
        /* Unmap sense buffer */
        dprintkdbg(DBG_SG, "pci_unmap_srb_sense: buffer=%08x\n",
               srb->segment_x[0].address);
        pci_unmap_single(acb->dev, srb->segment_x[0].address,
                         srb->segment_x[0].length, PCI_DMA_FROMDEVICE);
        /* Restore SG stuff */
        srb->total_xfer_length = srb->xferred;
        srb->segment_x[0].address =
            srb->segment_x[DC395x_MAX_SG_LISTENTRY - 1].address;
        srb->segment_x[0].length =
            srb->segment_x[DC395x_MAX_SG_LISTENTRY - 1].length;
}


/*
 * Complete execution of a SCSI command
 * Signal completion to the generic SCSI driver  
 */
static void srb_done(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
                struct ScsiReqBlk *srb)
{
        u8 tempcnt, status;
        struct scsi_cmnd *cmd = srb->cmd;
        enum dma_data_direction dir = cmd->sc_data_direction;
        int ckc_only = 1;

        dprintkdbg(DBG_1, "srb_done: (0x%p) <%02i-%i>\n", srb->cmd,
                srb->cmd->device->id, (u8)srb->cmd->device->lun);
        dprintkdbg(DBG_SG, "srb_done: srb=%p sg=%i(%i/%i) buf=%p\n",
                   srb, scsi_sg_count(cmd), srb->sg_index, srb->sg_count,
                   scsi_sgtalbe(cmd));
        status = srb->target_status;
        if (srb->flag & AUTO_REQSENSE) {
                dprintkdbg(DBG_0, "srb_done: AUTO_REQSENSE1\n");
                pci_unmap_srb_sense(acb, srb);
                /*
                 ** target status..........................
                 */
                srb->flag &= ~AUTO_REQSENSE;
                srb->adapter_status = 0;
                srb->target_status = CHECK_CONDITION << 1;
                if (debug_enabled(DBG_1)) {
                        switch (cmd->sense_buffer[2] & 0x0f) {
                        case NOT_READY:
                                dprintkl(KERN_DEBUG,
                                     "ReqSense: NOT_READY cmnd=0x%02x <%02i-%i> stat=%i scan=%i ",
                                     cmd->cmnd[0], dcb->target_id,
                                     dcb->target_lun, status, acb->scan_devices);
                                break;
                        case UNIT_ATTENTION:
                                dprintkl(KERN_DEBUG,
                                     "ReqSense: UNIT_ATTENTION cmnd=0x%02x <%02i-%i> stat=%i scan=%i ",
                                     cmd->cmnd[0], dcb->target_id,
                                     dcb->target_lun, status, acb->scan_devices);
                                break;
                        case ILLEGAL_REQUEST:
                                dprintkl(KERN_DEBUG,
                                     "ReqSense: ILLEGAL_REQUEST cmnd=0x%02x <%02i-%i> stat=%i scan=%i ",
                                     cmd->cmnd[0], dcb->target_id,
                                     dcb->target_lun, status, acb->scan_devices);
                                break;
                        case MEDIUM_ERROR:
                                dprintkl(KERN_DEBUG,
                                     "ReqSense: MEDIUM_ERROR cmnd=0x%02x <%02i-%i> stat=%i scan=%i ",
                                     cmd->cmnd[0], dcb->target_id,
                                     dcb->target_lun, status, acb->scan_devices);
                                break;
                        case HARDWARE_ERROR:
                                dprintkl(KERN_DEBUG,
                                     "ReqSense: HARDWARE_ERROR cmnd=0x%02x <%02i-%i> stat=%i scan=%i ",
                                     cmd->cmnd[0], dcb->target_id,
                                     dcb->target_lun, status, acb->scan_devices);
                                break;
                        }
                        if (cmd->sense_buffer[7] >= 6)
                                printk("sense=0x%02x ASC=0x%02x ASCQ=0x%02x "
                                        "(0x%08x 0x%08x)\n",
                                        cmd->sense_buffer[2], cmd->sense_buffer[12],
                                        cmd->sense_buffer[13],
                                        *((unsigned int *)(cmd->sense_buffer + 3)),
                                        *((unsigned int *)(cmd->sense_buffer + 8)));
                        else
                                printk("sense=0x%02x No ASC/ASCQ (0x%08x)\n",
                                        cmd->sense_buffer[2],
                                        *((unsigned int *)(cmd->sense_buffer + 3)));
                }

                if (status == (CHECK_CONDITION << 1)) {
                        cmd->result = DID_BAD_TARGET << 16;
                        goto ckc_e;
                }
                dprintkdbg(DBG_0, "srb_done: AUTO_REQSENSE2\n");

                if (srb->total_xfer_length
                    && srb->total_xfer_length >= cmd->underflow)
                        cmd->result =
                            MK_RES_LNX(DRIVER_SENSE, DID_OK,
                                       srb->end_message, CHECK_CONDITION);
                /*SET_RES_DID(cmd->result,DID_OK) */
                else
                        cmd->result =
                            MK_RES_LNX(DRIVER_SENSE, DID_OK,
                                       srb->end_message, CHECK_CONDITION);

                goto ckc_e;
        }

/*************************************************************/
        if (status) {
                /*
                 * target status..........................
                 */
                if (status_byte(status) == CHECK_CONDITION) {
                        request_sense(acb, dcb, srb);
                        return;
                } else if (status_byte(status) == QUEUE_FULL) {
                        tempcnt = (u8)list_size(&dcb->srb_going_list);
                        dprintkl(KERN_INFO, "QUEUE_FULL for dev <%02i-%i> with %i cmnds\n",
                             dcb->target_id, dcb->target_lun, tempcnt);
                        if (tempcnt > 1)
                                tempcnt--;
                        dcb->max_command = tempcnt;
                        free_tag(dcb, srb);
                        srb_going_to_waiting_move(dcb, srb);
                        waiting_set_timer(acb, HZ / 20);
                        srb->adapter_status = 0;
                        srb->target_status = 0;
                        return;
                } else if (status == SCSI_STAT_SEL_TIMEOUT) {
                        srb->adapter_status = H_SEL_TIMEOUT;
                        srb->target_status = 0;
                        cmd->result = DID_NO_CONNECT << 16;
                } else {
                        srb->adapter_status = 0;
                        SET_RES_DID(cmd->result, DID_ERROR);
                        SET_RES_MSG(cmd->result, srb->end_message);
                        SET_RES_TARGET(cmd->result, status);

                }
        } else {
                /*
                 ** process initiator status..........................
                 */
                status = srb->adapter_status;
                if (status & H_OVER_UNDER_RUN) {
                        srb->target_status = 0;
                        SET_RES_DID(cmd->result, DID_OK);
                        SET_RES_MSG(cmd->result, srb->end_message);
                } else if (srb->status & PARITY_ERROR) {
                        SET_RES_DID(cmd->result, DID_PARITY);
                        SET_RES_MSG(cmd->result, srb->end_message);
                } else {        /* No error */

                        srb->adapter_status = 0;
                        srb->target_status = 0;
                        SET_RES_DID(cmd->result, DID_OK);
                }
        }

        if (dir != PCI_DMA_NONE && scsi_sg_count(cmd))
                pci_dma_sync_sg_for_cpu(acb->dev, scsi_sglist(cmd),
                                        scsi_sg_count(cmd), dir);

        ckc_only = 0;
/* Check Error Conditions */
      ckc_e:

        if (cmd->cmnd[0] == INQUIRY) {
                unsigned char *base = NULL;
                struct ScsiInqData *ptr;
                unsigned long flags = 0;
                struct scatterlist* sg = scsi_sglist(cmd);
                size_t offset = 0, len = sizeof(struct ScsiInqData);

                local_irq_save(flags);
                base = scsi_kmap_atomic_sg(sg, scsi_sg_count(cmd), &offset, &len);
                ptr = (struct ScsiInqData *)(base + offset);

                if (!ckc_only && (cmd->result & RES_DID) == 0
                    && cmd->cmnd[2] == 0 && scsi_bufflen(cmd) >= 8
                    && dir != PCI_DMA_NONE && ptr && (ptr->Vers & 0x07) >= 2)
                        dcb->inquiry7 = ptr->Flags;

        /*if( srb->cmd->cmnd[0] == INQUIRY && */
        /*  (host_byte(cmd->result) == DID_OK || status_byte(cmd->result) & CHECK_CONDITION) ) */
                if ((cmd->result == (DID_OK << 16)
                     || status_byte(cmd->result) &
                     CHECK_CONDITION)) {
                        if (!dcb->init_tcq_flag) {
                                add_dev(acb, dcb, ptr);
                                dcb->init_tcq_flag = 1;
                        }
                }

                scsi_kunmap_atomic_sg(base);
                local_irq_restore(flags);
        }

        /* Here is the info for Doug Gilbert's sg3 ... */
        scsi_set_resid(cmd, srb->total_xfer_length);
        /* This may be interpreted by sb. or not ... */
        cmd->SCp.this_residual = srb->total_xfer_length;
        cmd->SCp.buffers_residual = 0;
        if (debug_enabled(DBG_KG)) {
                if (srb->total_xfer_length)
                        dprintkdbg(DBG_KG, "srb_done: (0x%p) <%02i-%i> "
                                "cmnd=0x%02x Missed %i bytes\n",
                                cmd, cmd->device->id, (u8)cmd->device->lun,
                                cmd->cmnd[0], srb->total_xfer_length);
        }

        srb_going_remove(dcb, srb);
        /* Add to free list */
        if (srb == acb->tmp_srb)
                dprintkl(KERN_ERR, "srb_done: ERROR! Completed cmd with tmp_srb\n");
        else {
                dprintkdbg(DBG_0, "srb_done: (0x%p) done result=0x%08x\n",
                        cmd, cmd->result);
                srb_free_insert(acb, srb);
        }
        pci_unmap_srb(acb, srb);

        cmd->scsi_done(cmd);
        waiting_process_next(acb);
}


/* abort all cmds in our queues */
static void doing_srb_done(struct AdapterCtlBlk *acb, u8 did_flag,
                struct scsi_cmnd *cmd, u8 force)
{
        struct DeviceCtlBlk *dcb;
        dprintkl(KERN_INFO, "doing_srb_done: pids ");

        list_for_each_entry(dcb, &acb->dcb_list, list) {
                struct ScsiReqBlk *srb;
                struct ScsiReqBlk *tmp;
                struct scsi_cmnd *p;

                list_for_each_entry_safe(srb, tmp, &dcb->srb_going_list, list) {
                        enum dma_data_direction dir;
                        int result;

                        p = srb->cmd;
                        dir = p->sc_data_direction;
                        result = MK_RES(0, did_flag, 0, 0);
                        printk("G:%p(%02i-%i) ", p,
                               p->device->id, (u8)p->device->lun);
                        srb_going_remove(dcb, srb);
                        free_tag(dcb, srb);
                        srb_free_insert(acb, srb);
                        p->result = result;
                        pci_unmap_srb_sense(acb, srb);
                        pci_unmap_srb(acb, srb);
                        if (force) {
                                /* For new EH, we normally don't need to give commands back,
                                 * as they all complete or all time out */
                                p->scsi_done(p);
                        }
                }
                if (!list_empty(&dcb->srb_going_list))
                        dprintkl(KERN_DEBUG, 
                               "How could the ML send cmnds to the Going queue? <%02i-%i>\n",
                               dcb->target_id, dcb->target_lun);
                if (dcb->tag_mask)
                        dprintkl(KERN_DEBUG,
                               "tag_mask for <%02i-%i> should be empty, is %08x!\n",
                               dcb->target_id, dcb->target_lun,
                               dcb->tag_mask);

                /* Waiting queue */
                list_for_each_entry_safe(srb, tmp, &dcb->srb_waiting_list, list) {
                        int result;
                        p = srb->cmd;

                        result = MK_RES(0, did_flag, 0, 0);
                        printk("W:%p<%02i-%i>", p, p->device->id,
                               (u8)p->device->lun);
                        srb_waiting_remove(dcb, srb);
                        srb_free_insert(acb, srb);
                        p->result = result;
                        pci_unmap_srb_sense(acb, srb);
                        pci_unmap_srb(acb, srb);
                        if (force) {
                                /* For new EH, we normally don't need to give commands back,
                                 * as they all complete or all time out */
                                cmd->scsi_done(cmd);
                        }
                }
                if (!list_empty(&dcb->srb_waiting_list))
                        dprintkl(KERN_DEBUG, "ML queued %i cmnds again to <%02i-%i>\n",
                             list_size(&dcb->srb_waiting_list), dcb->target_id,
                             dcb->target_lun);
                dcb->flag &= ~ABORT_DEV_;
        }
        printk("\n");
}


static void reset_scsi_bus(struct AdapterCtlBlk *acb)
{
        dprintkdbg(DBG_0, "reset_scsi_bus: acb=%p\n", acb);
        acb->acb_flag |= RESET_DEV;     /* RESET_DETECT, RESET_DONE, RESET_DEV */
        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_RSTSCSI);

        while (!(DC395x_read8(acb, TRM_S1040_SCSI_INTSTATUS) & INT_SCSIRESET))
                /* nothing */;
}


static void set_basic_config(struct AdapterCtlBlk *acb)
{
        u8 bval;
        u16 wval;
        DC395x_write8(acb, TRM_S1040_SCSI_TIMEOUT, acb->sel_timeout);
        if (acb->config & HCC_PARITY)
                bval = PHASELATCH | INITIATOR | BLOCKRST | PARITYCHECK;
        else
                bval = PHASELATCH | INITIATOR | BLOCKRST;

        DC395x_write8(acb, TRM_S1040_SCSI_CONFIG0, bval);

        /* program configuration 1: Act_Neg (+ Act_Neg_Enh? + Fast_Filter? + DataDis?) */
        DC395x_write8(acb, TRM_S1040_SCSI_CONFIG1, 0x03);       /* was 0x13: default */
        /* program Host ID                  */
        DC395x_write8(acb, TRM_S1040_SCSI_HOSTID, acb->scsi_host->this_id);
        /* set ansynchronous transfer       */
        DC395x_write8(acb, TRM_S1040_SCSI_OFFSET, 0x00);
        /* Turn LED control off */
        wval = DC395x_read16(acb, TRM_S1040_GEN_CONTROL) & 0x7F;
        DC395x_write16(acb, TRM_S1040_GEN_CONTROL, wval);
        /* DMA config          */
        wval = DC395x_read16(acb, TRM_S1040_DMA_CONFIG) & ~DMA_FIFO_CTRL;
        wval |=
            DMA_FIFO_HALF_HALF | DMA_ENHANCE /*| DMA_MEM_MULTI_READ */ ;
        DC395x_write16(acb, TRM_S1040_DMA_CONFIG, wval);
        /* Clear pending interrupt status */
        DC395x_read8(acb, TRM_S1040_SCSI_INTSTATUS);
        /* Enable SCSI interrupt    */
        DC395x_write8(acb, TRM_S1040_SCSI_INTEN, 0x7F);
        DC395x_write8(acb, TRM_S1040_DMA_INTEN, EN_SCSIINTR | EN_DMAXFERERROR
                      /*| EN_DMAXFERABORT | EN_DMAXFERCOMP | EN_FORCEDMACOMP */
                      );
}


static void scsi_reset_detect(struct AdapterCtlBlk *acb)
{
        dprintkl(KERN_INFO, "scsi_reset_detect: acb=%p\n", acb);
        /* delay half a second */
        if (timer_pending(&acb->waiting_timer))
                del_timer(&acb->waiting_timer);

        DC395x_write8(acb, TRM_S1040_SCSI_CONTROL, DO_RSTMODULE);
        DC395x_write8(acb, TRM_S1040_DMA_CONTROL, DMARESETMODULE);
        /*DC395x_write8(acb, TRM_S1040_DMA_CONTROL,STOPDMAXFER); */
        udelay(500);
        /* Maybe we locked up the bus? Then lets wait even longer ... */
        acb->last_reset =
            jiffies + 5 * HZ / 2 +
            HZ * acb->eeprom.delay_time;

        clear_fifo(acb, "scsi_reset_detect");
        set_basic_config(acb);
        /*1.25 */
        /*DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_HWRESELECT); */

        if (acb->acb_flag & RESET_DEV) {        /* RESET_DETECT, RESET_DONE, RESET_DEV */
                acb->acb_flag |= RESET_DONE;
        } else {
                acb->acb_flag |= RESET_DETECT;
                reset_dev_param(acb);
                doing_srb_done(acb, DID_RESET, NULL, 1);
                /*DC395x_RecoverSRB( acb ); */
                acb->active_dcb = NULL;
                acb->acb_flag = 0;
                waiting_process_next(acb);
        }
}


static void request_sense(struct AdapterCtlBlk *acb, struct DeviceCtlBlk *dcb,
                struct ScsiReqBlk *srb)
{
        struct scsi_cmnd *cmd = srb->cmd;
        dprintkdbg(DBG_1, "request_sense: (0x%p) <%02i-%i>\n",
                cmd, cmd->device->id, (u8)cmd->device->lun);

        srb->flag |= AUTO_REQSENSE;
        srb->adapter_status = 0;
        srb->target_status = 0;

        /* KG: Can this prevent crap sense data ? */
        memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);

        /* Save some data */
        srb->segment_x[DC395x_MAX_SG_LISTENTRY - 1].address =
            srb->segment_x[0].address;
        srb->segment_x[DC395x_MAX_SG_LISTENTRY - 1].length =
            srb->segment_x[0].length;
        srb->xferred = srb->total_xfer_length;
        /* srb->segment_x : a one entry of S/G list table */
        srb->total_xfer_length = SCSI_SENSE_BUFFERSIZE;
        srb->segment_x[0].length = SCSI_SENSE_BUFFERSIZE;
        /* Map sense buffer */
        srb->segment_x[0].address =
            pci_map_single(acb->dev, cmd->sense_buffer,
                           SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE);
        dprintkdbg(DBG_SG, "request_sense: map buffer %p->%08x(%05x)\n",
               cmd->sense_buffer, srb->segment_x[0].address,
               SCSI_SENSE_BUFFERSIZE);
        srb->sg_count = 1;
        srb->sg_index = 0;

        if (start_scsi(acb, dcb, srb)) {        /* Should only happen, if sb. else grabs the bus */
                dprintkl(KERN_DEBUG,
                        "request_sense: (0x%p) failed <%02i-%i>\n",
                        srb->cmd, dcb->target_id, dcb->target_lun);
                srb_going_to_waiting_move(dcb, srb);
                waiting_set_timer(acb, HZ / 100);
        }
}


/**
 * device_alloc - Allocate a new device instance. This create the
 * devices instance and sets up all the data items. The adapter
 * instance is required to obtain confiuration information for this
 * device. This does *not* add this device to the adapters device
 * list.
 *
 * @acb: The adapter to obtain configuration information from.
 * @target: The target for the new device.
 * @lun: The lun for the new device.
 *
 * Return the new device if successful or NULL on failure.
 **/
static struct DeviceCtlBlk *device_alloc(struct AdapterCtlBlk *acb,
                u8 target, u8 lun)
{
        struct NvRamType *eeprom = &acb->eeprom;
        u8 period_index = eeprom->target[target].period & 0x07;
        struct DeviceCtlBlk *dcb;

        dcb = kmalloc(sizeof(struct DeviceCtlBlk), GFP_ATOMIC);
        dprintkdbg(DBG_0, "device_alloc: <%02i-%i>\n", target, lun);
        if (!dcb)
                return NULL;
        dcb->acb = NULL;
        INIT_LIST_HEAD(&dcb->srb_going_list);
        INIT_LIST_HEAD(&dcb->srb_waiting_list);
        dcb->active_srb = NULL;
        dcb->tag_mask = 0;
        dcb->max_command = 1;
        dcb->target_id = target;
        dcb->target_lun = lun;
        dcb->dev_mode = eeprom->target[target].cfg0;
#ifndef DC395x_NO_DISCONNECT
        dcb->identify_msg =
            IDENTIFY(dcb->dev_mode & NTC_DO_DISCONNECT, lun);
#else
        dcb->identify_msg = IDENTIFY(0, lun);
#endif
        dcb->inquiry7 = 0;
        dcb->sync_mode = 0;
        dcb->min_nego_period = clock_period[period_index];
        dcb->sync_period = 0;
        dcb->sync_offset = 0;
        dcb->flag = 0;

#ifndef DC395x_NO_WIDE
        if ((dcb->dev_mode & NTC_DO_WIDE_NEGO)
            && (acb->config & HCC_WIDE_CARD))
                dcb->sync_mode |= WIDE_NEGO_ENABLE;
#endif
#ifndef DC395x_NO_SYNC
        if (dcb->dev_mode & NTC_DO_SYNC_NEGO)
                if (!(lun) || current_sync_offset)
                        dcb->sync_mode |= SYNC_NEGO_ENABLE;
#endif
        if (dcb->target_lun != 0) {
                /* Copy settings */
                struct DeviceCtlBlk *p;
                list_for_each_entry(p, &acb->dcb_list, list)
                        if (p->target_id == dcb->target_id)
                                break;
                dprintkdbg(DBG_1, 
                       "device_alloc: <%02i-%i> copy from <%02i-%i>\n",
                       dcb->target_id, dcb->target_lun,
                       p->target_id, p->target_lun);
                dcb->sync_mode = p->sync_mode;
                dcb->sync_period = p->sync_period;
                dcb->min_nego_period = p->min_nego_period;
                dcb->sync_offset = p->sync_offset;
                dcb->inquiry7 = p->inquiry7;
        }
        return dcb;
}


/**
 * adapter_add_device - Adds the device instance to the adaptor instance.
 *
 * @acb: The adapter device to be updated
 * @dcb: A newly created and initialised device instance to add.
 **/
static void adapter_add_device(struct AdapterCtlBlk *acb,
                struct DeviceCtlBlk *dcb)
{
        /* backpointer to adapter */
        dcb->acb = acb;
        
        /* set run_robin to this device if it is currently empty */
        if (list_empty(&acb->dcb_list))
                acb->dcb_run_robin = dcb;

        /* add device to list */
        list_add_tail(&dcb->list, &acb->dcb_list);

        /* update device maps */
        acb->dcb_map[dcb->target_id] |= (1 << dcb->target_lun);
        acb->children[dcb->target_id][dcb->target_lun] = dcb;
}


/**
 * adapter_remove_device - Removes the device instance from the adaptor
 * instance. The device instance is not check in any way or freed by this. 
 * The caller is expected to take care of that. This will simply remove the
 * device from the adapters data strcutures.
 *
 * @acb: The adapter device to be updated
 * @dcb: A device that has previously been added to the adapter.
 **/
static void adapter_remove_device(struct AdapterCtlBlk *acb,
                struct DeviceCtlBlk *dcb)
{
        struct DeviceCtlBlk *i;
        struct DeviceCtlBlk *tmp;
        dprintkdbg(DBG_0, "adapter_remove_device: <%02i-%i>\n",
                dcb->target_id, dcb->target_lun);

        /* fix up any pointers to this device that we have in the adapter */
        if (acb->active_dcb == dcb)
                acb->active_dcb = NULL;
        if (acb->dcb_run_robin == dcb)
                acb->dcb_run_robin = dcb_get_next(&acb->dcb_list, dcb);

        /* unlink from list */
        list_for_each_entry_safe(i, tmp, &acb->dcb_list, list)
                if (dcb == i) {
                        list_del(&i->list);
                        break;
                }

        /* clear map and children */    
        acb->dcb_map[dcb->target_id] &= ~(1 << dcb->target_lun);
        acb->children[dcb->target_id][dcb->target_lun] = NULL;
        dcb->acb = NULL;
}


/**
 * adapter_remove_and_free_device - Removes a single device from the adapter
 * and then frees the device information.
 *
 * @acb: The adapter device to be updated
 * @dcb: A device that has previously been added to the adapter.
 */
static void adapter_remove_and_free_device(struct AdapterCtlBlk *acb,
                struct DeviceCtlBlk *dcb)
{
        if (list_size(&dcb->srb_going_list) > 1) {
                dprintkdbg(DBG_1, "adapter_remove_and_free_device: <%02i-%i> "
                           "Won't remove because of %i active requests.\n",
                           dcb->target_id, dcb->target_lun,
                           list_size(&dcb->srb_going_list));
                return;
        }
        adapter_remove_device(acb, dcb);
        kfree(dcb);
}


/**
 * adapter_remove_and_free_all_devices - Removes and frees all of the
 * devices associated with the specified adapter.
 *
 * @acb: The adapter from which all devices should be removed.
 **/
static void adapter_remove_and_free_all_devices(struct AdapterCtlBlk* acb)
{
        struct DeviceCtlBlk *dcb;
        struct DeviceCtlBlk *tmp;
        dprintkdbg(DBG_1, "adapter_remove_and_free_all_devices: num=%i\n",
                   list_size(&acb->dcb_list));

        list_for_each_entry_safe(dcb, tmp, &acb->dcb_list, list)
                adapter_remove_and_free_device(acb, dcb);
}


/**
 * dc395x_slave_alloc - Called by the scsi mid layer to tell us about a new
 * scsi device that we need to deal with. We allocate a new device and then
 * insert that device into the adapters device list.
 *
 * @scsi_device: The new scsi device that we need to handle.
 **/
static int dc395x_slave_alloc(struct scsi_device *scsi_device)
{
        struct AdapterCtlBlk *acb = (struct AdapterCtlBlk *)scsi_device->host->hostdata;
        struct DeviceCtlBlk *dcb;

        dcb = device_alloc(acb, scsi_device->id, scsi_device->lun);
        if (!dcb)
                return -ENOMEM;
        adapter_add_device(acb, dcb);

        return 0;
}


/**
 * dc395x_slave_destroy - Called by the scsi mid layer to tell us about a
 * device that is going away.
 *
 * @scsi_device: The new scsi device that we need to handle.
 **/
static void dc395x_slave_destroy(struct scsi_device *scsi_device)
{
        struct AdapterCtlBlk *acb = (struct AdapterCtlBlk *)scsi_device->host->hostdata;
        struct DeviceCtlBlk *dcb = find_dcb(acb, scsi_device->id, scsi_device->lun);
        if (dcb)
                adapter_remove_and_free_device(acb, dcb);
}




/**
 * trms1040_wait_30us: wait for 30 us
 *
 * Waits for 30us (using the chip by the looks of it..)
 *
 * @io_port: base I/O address
 **/
static void trms1040_wait_30us(unsigned long io_port)
{
        /* ScsiPortStallExecution(30); wait 30 us */
        outb(5, io_port + TRM_S1040_GEN_TIMER);
        while (!(inb(io_port + TRM_S1040_GEN_STATUS) & GTIMEOUT))
                /* nothing */ ;
}


/**
 * trms1040_write_cmd - write the secified command and address to
 * chip
 *
 * @io_port:    base I/O address
 * @cmd:        SB + op code (command) to send
 * @addr:       address to send
 **/
static void trms1040_write_cmd(unsigned long io_port, u8 cmd, u8 addr)
{
        int i;
        u8 send_data;

        /* program SB + OP code */
        for (i = 0; i < 3; i++, cmd <<= 1) {
                send_data = NVR_SELECT;
                if (cmd & 0x04) /* Start from bit 2 */
                        send_data |= NVR_BITOUT;

                outb(send_data, io_port + TRM_S1040_GEN_NVRAM);
                trms1040_wait_30us(io_port);
                outb((send_data | NVR_CLOCK),
                     io_port + TRM_S1040_GEN_NVRAM);
                trms1040_wait_30us(io_port);
        }

        /* send address */
        for (i = 0; i < 7; i++, addr <<= 1) {
                send_data = NVR_SELECT;
                if (addr & 0x40)        /* Start from bit 6 */
                        send_data |= NVR_BITOUT;

                outb(send_data, io_port + TRM_S1040_GEN_NVRAM);
                trms1040_wait_30us(io_port);
                outb((send_data | NVR_CLOCK),
                     io_port + TRM_S1040_GEN_NVRAM);
                trms1040_wait_30us(io_port);
        }
        outb(NVR_SELECT, io_port + TRM_S1040_GEN_NVRAM);
        trms1040_wait_30us(io_port);
}


/**
 * trms1040_set_data - store a single byte in the eeprom
 *
 * Called from write all to write a single byte into the SSEEPROM
 * Which is done one bit at a time.
 *
 * @io_port:    base I/O address
 * @addr:       offset into EEPROM
 * @byte:       bytes to write
 **/
static void trms1040_set_data(unsigned long io_port, u8 addr, u8 byte)
{
        int i;
        u8 send_data;

        /* Send write command & address */
        trms1040_write_cmd(io_port, 0x05, addr);

        /* Write data */
        for (i = 0; i < 8; i++, byte <<= 1) {
                send_data = NVR_SELECT;
                if (byte & 0x80)        /* Start from bit 7 */
                        send_data |= NVR_BITOUT;

                outb(send_data, io_port + TRM_S1040_GEN_NVRAM);
                trms1040_wait_30us(io_port);
                outb((send_data | NVR_CLOCK), io_port + TRM_S1040_GEN_NVRAM);
                trms1040_wait_30us(io_port);
        }
        outb(NVR_SELECT, io_port + TRM_S1040_GEN_NVRAM);
        trms1040_wait_30us(io_port);

        /* Disable chip select */
        outb(0, io_port + TRM_S1040_GEN_NVRAM);
        trms1040_wait_30us(io_port);

        outb(NVR_SELECT, io_port + TRM_S1040_GEN_NVRAM);
        trms1040_wait_30us(io_port);

        /* Wait for write ready */
        while (1) {
                outb((NVR_SELECT | NVR_CLOCK), io_port + TRM_S1040_GEN_NVRAM);
                trms1040_wait_30us(io_port);

                outb(NVR_SELECT, io_port + TRM_S1040_GEN_NVRAM);
                trms1040_wait_30us(io_port);

                if (inb(io_port + TRM_S1040_GEN_NVRAM) & NVR_BITIN)
                        break;
        }

        /*  Disable chip select */
        outb(0, io_port + TRM_S1040_GEN_NVRAM);
}


/**
 * trms1040_write_all - write 128 bytes to the eeprom
 *
 * Write the supplied 128 bytes to the chips SEEPROM
 *
 * @eeprom:     the data to write
 * @io_port:    the base io port
 **/
static void trms1040_write_all(struct NvRamType *eeprom, unsigned long io_port)
{
        u8 *b_eeprom = (u8 *)eeprom;
        u8 addr;

        /* Enable SEEPROM */
        outb((inb(io_port + TRM_S1040_GEN_CONTROL) | EN_EEPROM),
             io_port + TRM_S1040_GEN_CONTROL);

        /* write enable */
        trms1040_write_cmd(io_port, 0x04, 0xFF);
        outb(0, io_port + TRM_S1040_GEN_NVRAM);
        trms1040_wait_30us(io_port);

        /* write */
        for (addr = 0; addr < 128; addr++, b_eeprom++)
                trms1040_set_data(io_port, addr, *b_eeprom);

        /* write disable */
        trms1040_write_cmd(io_port, 0x04, 0x00);
        outb(0, io_port + TRM_S1040_GEN_NVRAM);
        trms1040_wait_30us(io_port);

        /* Disable SEEPROM */
        outb((inb(io_port + TRM_S1040_GEN_CONTROL) & ~EN_EEPROM),
             io_port + TRM_S1040_GEN_CONTROL);
}


/**
 * trms1040_get_data - get a single byte from the eeprom
 *
 * Called from read all to read a single byte into the SSEEPROM
 * Which is done one bit at a time.
 *
 * @io_port:    base I/O address
 * @addr:       offset into SEEPROM
 *
 * Returns the byte read.
 **/
static u8 trms1040_get_data(unsigned long io_port, u8 addr)
{
        int i;
        u8 read_byte;
        u8 result = 0;

        /* Send read command & address */
        trms1040_write_cmd(io_port, 0x06, addr);

        /* read data */
        for (i = 0; i < 8; i++) {
                outb((NVR_SELECT | NVR_CLOCK), io_port + TRM_S1040_GEN_NVRAM);
                trms1040_wait_30us(io_port);
                outb(NVR_SELECT, io_port + TRM_S1040_GEN_NVRAM);

                /* Get data bit while falling edge */
                read_byte = inb(io_port + TRM_S1040_GEN_NVRAM);
                result <<= 1;
                if (read_byte & NVR_BITIN)
                        result |= 1;

                trms1040_wait_30us(io_port);
        }

        /* Disable chip select */
        outb(0, io_port + TRM_S1040_GEN_NVRAM);
        return result;
}


/**
 * trms1040_read_all - read all bytes from the eeprom
 *
 * Read the 128 bytes from the SEEPROM.
 *
 * @eeprom:     where to store the data
 * @io_port:    the base io port
 **/
static void trms1040_read_all(struct NvRamType *eeprom, unsigned long io_port)
{
        u8 *b_eeprom = (u8 *)eeprom;
        u8 addr;

        /* Enable SEEPROM */
        outb((inb(io_port + TRM_S1040_GEN_CONTROL) | EN_EEPROM),
             io_port + TRM_S1040_GEN_CONTROL);

        /* read details */
        for (addr = 0; addr < 128; addr++, b_eeprom++)
                *b_eeprom = trms1040_get_data(io_port, addr);

        /* Disable SEEPROM */
        outb((inb(io_port + TRM_S1040_GEN_CONTROL) & ~EN_EEPROM),
             io_port + TRM_S1040_GEN_CONTROL);
}



/**
 * check_eeprom - get and check contents of the eeprom
 *
 * Read seeprom 128 bytes into the memory provider in eeprom.
 * Checks the checksum and if it's not correct it uses a set of default
 * values.
 *
 * @eeprom:     caller allocated strcuture to read the eeprom data into
 * @io_port:    io port to read from
 **/
static void check_eeprom(struct NvRamType *eeprom, unsigned long io_port)
{
        u16 *w_eeprom = (u16 *)eeprom;
        u16 w_addr;
        u16 cksum;
        u32 d_addr;
        u32 *d_eeprom;

        trms1040_read_all(eeprom, io_port);     /* read eeprom */

        cksum = 0;
        for (w_addr = 0, w_eeprom = (u16 *)eeprom; w_addr < 64;
             w_addr++, w_eeprom++)
                cksum += *w_eeprom;
        if (cksum != 0x1234) {
                /*
                 * Checksum is wrong.
                 * Load a set of defaults into the eeprom buffer
                 */
                dprintkl(KERN_WARNING,
                        "EEProm checksum error: using default values and options.\n");
                eeprom->sub_vendor_id[0] = (u8)PCI_VENDOR_ID_TEKRAM;
                eeprom->sub_vendor_id[1] = (u8)(PCI_VENDOR_ID_TEKRAM >> 8);
                eeprom->sub_sys_id[0] = (u8)PCI_DEVICE_ID_TEKRAM_TRMS1040;
                eeprom->sub_sys_id[1] =
                    (u8)(PCI_DEVICE_ID_TEKRAM_TRMS1040 >> 8);
                eeprom->sub_class = 0x00;
                eeprom->vendor_id[0] = (u8)PCI_VENDOR_ID_TEKRAM;
                eeprom->vendor_id[1] = (u8)(PCI_VENDOR_ID_TEKRAM >> 8);
                eeprom->device_id[0] = (u8)PCI_DEVICE_ID_TEKRAM_TRMS1040;
                eeprom->device_id[1] =
                    (u8)(PCI_DEVICE_ID_TEKRAM_TRMS1040 >> 8);
                eeprom->reserved = 0x00;

                for (d_addr = 0, d_eeprom = (u32 *)eeprom->target;
                     d_addr < 16; d_addr++, d_eeprom++)
                        *d_eeprom = 0x00000077; /* cfg3,cfg2,period,cfg0 */

                *d_eeprom++ = 0x04000F07;       /* max_tag,delay_time,channel_cfg,scsi_id */
                *d_eeprom++ = 0x00000015;       /* reserved1,boot_lun,boot_target,reserved0 */
                for (d_addr = 0; d_addr < 12; d_addr++, d_eeprom++)
                        *d_eeprom = 0x00;

                /* Now load defaults (maybe set by boot/module params) */
                set_safe_settings();
                fix_settings();
                eeprom_override(eeprom);

                eeprom->cksum = 0x00;
                for (w_addr = 0, cksum = 0, w_eeprom = (u16 *)eeprom;
                     w_addr < 63; w_addr++, w_eeprom++)
                        cksum += *w_eeprom;

                *w_eeprom = 0x1234 - cksum;
                trms1040_write_all(eeprom, io_port);
                eeprom->delay_time = cfg_data[CFG_RESET_DELAY].value;
        } else {
                set_safe_settings();
                eeprom_index_to_delay(eeprom);
                eeprom_override(eeprom);
        }
}


/**
 * print_eeprom_settings - output the eeprom settings
 * to the kernel log so people can see what they were.
 *
 * @eeprom: The eeprom data strucutre to show details for.
 **/
static void print_eeprom_settings(struct NvRamType *eeprom)
{
        dprintkl(KERN_INFO, "Used settings: AdapterID=%02i, Speed=%i(%02i.%01iMHz), dev_mode=0x%02x\n",
                eeprom->scsi_id,
                eeprom->target[0].period,
                clock_speed[eeprom->target[0].period] / 10,
                clock_speed[eeprom->target[0].period] % 10,
                eeprom->target[0].cfg0);
        dprintkl(KERN_INFO, "               AdaptMode=0x%02x, Tags=%i(%02i), DelayReset=%is\n",
                eeprom->channel_cfg, eeprom->max_tag,
                1 << eeprom->max_tag, eeprom->delay_time);
}


/* Free SG tables */
static void adapter_sg_tables_free(struct AdapterCtlBlk *acb)
{
        int i;
        const unsigned srbs_per_page = PAGE_SIZE/SEGMENTX_LEN;

        for (i = 0; i < DC395x_MAX_SRB_CNT; i += srbs_per_page)
                kfree(acb->srb_array[i].segment_x);
}


/*
 * Allocate SG tables; as we have to pci_map them, an SG list (struct SGentry*)
 * should never cross a page boundary */
static int adapter_sg_tables_alloc(struct AdapterCtlBlk *acb)
{
        const unsigned mem_needed = (DC395x_MAX_SRB_CNT+1)
                                    *SEGMENTX_LEN;
        int pages = (mem_needed+(PAGE_SIZE-1))/PAGE_SIZE;
        const unsigned srbs_per_page = PAGE_SIZE/SEGMENTX_LEN;
        int srb_idx = 0;
        unsigned i = 0;
        struct SGentry *uninitialized_var(ptr);

        for (i = 0; i < DC395x_MAX_SRB_CNT; i++)
                acb->srb_array[i].segment_x = NULL;

        dprintkdbg(DBG_1, "Allocate %i pages for SG tables\n", pages);
        while (pages--) {
                ptr = kmalloc(PAGE_SIZE, GFP_KERNEL);
                if (!ptr) {
                        adapter_sg_tables_free(acb);
                        return 1;
                }
                dprintkdbg(DBG_1, "Allocate %li bytes at %p for SG segments %i\n",
                        PAGE_SIZE, ptr, srb_idx);
                i = 0;
                while (i < srbs_per_page && srb_idx < DC395x_MAX_SRB_CNT)
                        acb->srb_array[srb_idx++].segment_x =
                            ptr + (i++ * DC395x_MAX_SG_LISTENTRY);
        }
        if (i < srbs_per_page)
                acb->srb.segment_x =
                    ptr + (i * DC395x_MAX_SG_LISTENTRY);
        else
                dprintkl(KERN_DEBUG, "No space for tmsrb SG table reserved?!\n");
        return 0;
}



/**
 * adapter_print_config - print adapter connection and termination
 * config
 *
 * The io port in the adapter needs to have been set before calling
 * this function.
 *
 * @acb: The adapter to print the information for.
 **/
static void adapter_print_config(struct AdapterCtlBlk *acb)
{
        u8 bval;

        bval = DC395x_read8(acb, TRM_S1040_GEN_STATUS);
        dprintkl(KERN_INFO, "%sConnectors: ",
                ((bval & WIDESCSI) ? "(Wide) " : ""));
        if (!(bval & CON5068))
                printk("ext%s ", !(bval & EXT68HIGH) ? "68" : "50");
        if (!(bval & CON68))
                printk("int68%s ", !(bval & INT68HIGH) ? "" : "(50)");
        if (!(bval & CON50))
                printk("int50 ");
        if ((bval & (CON5068 | CON50 | CON68)) ==
            0 /*(CON5068 | CON50 | CON68) */ )
                printk(" Oops! (All 3?) ");
        bval = DC395x_read8(acb, TRM_S1040_GEN_CONTROL);
        printk(" Termination: ");
        if (bval & DIS_TERM)
                printk("Disabled\n");
        else {
                if (bval & AUTOTERM)
                        printk("Auto ");
                if (bval & LOW8TERM)
                        printk("Low ");
                if (bval & UP8TERM)
                        printk("High ");
                printk("\n");
        }
}


/**
 * adapter_init_params - Initialize the various parameters in the
 * adapter structure. Note that the pointer to the scsi_host is set
 * early (when this instance is created) and the io_port and irq
 * values are set later after they have been reserved. This just gets
 * everything set to a good starting position.
 *
 * The eeprom structure in the adapter needs to have been set before
 * calling this function.
 *
 * @acb: The adapter to initialize.
 **/
static void adapter_init_params(struct AdapterCtlBlk *acb)
{
        struct NvRamType *eeprom = &acb->eeprom;
        int i;

        /* NOTE: acb->scsi_host is set at scsi_host/acb creation time */
        /* NOTE: acb->io_port_base is set at port registration time */
        /* NOTE: acb->io_port_len is set at port registration time */

        INIT_LIST_HEAD(&acb->dcb_list);
        acb->dcb_run_robin = NULL;
        acb->active_dcb = NULL;

        INIT_LIST_HEAD(&acb->srb_free_list);
        /*  temp SRB for Q tag used or abort command used  */
        acb->tmp_srb = &acb->srb;
        init_timer(&acb->waiting_timer);
        init_timer(&acb->selto_timer);

        acb->srb_count = DC395x_MAX_SRB_CNT;

        acb->sel_timeout = DC395x_SEL_TIMEOUT;  /* timeout=250ms */
        /* NOTE: acb->irq_level is set at IRQ registration time */

        acb->tag_max_num = 1 << eeprom->max_tag;
        if (acb->tag_max_num > 30)
                acb->tag_max_num = 30;

        acb->acb_flag = 0;      /* RESET_DETECT, RESET_DONE, RESET_DEV */
        acb->gmode2 = eeprom->channel_cfg;
        acb->config = 0;        /* NOTE: actually set in adapter_init_chip */

        if (eeprom->channel_cfg & NAC_SCANLUN)
                acb->lun_chk = 1;
        acb->scan_devices = 1;

        acb->scsi_host->this_id = eeprom->scsi_id;
        acb->hostid_bit = (1 << acb->scsi_host->this_id);

        for (i = 0; i < DC395x_MAX_SCSI_ID; i++)
                acb->dcb_map[i] = 0;

        acb->msg_len = 0;
        
        /* link static array of srbs into the srb free list */
        for (i = 0; i < acb->srb_count - 1; i++)
                srb_free_insert(acb, &acb->srb_array[i]);
}


/**
 * adapter_init_host - Initialize the scsi host instance based on
 * values that we have already stored in the adapter instance. There's
 * some mention that a lot of these are deprecated, so we won't use
 * them (we'll use the ones in the adapter instance) but we'll fill
 * them in in case something else needs them.
 *
 * The eeprom structure, irq and io ports in the adapter need to have
 * been set before calling this function.
 *
 * @host: The scsi host instance to fill in the values for.
 **/
static void adapter_init_scsi_host(struct Scsi_Host *host)
{
        struct AdapterCtlBlk *acb = (struct AdapterCtlBlk *)host->hostdata;
        struct NvRamType *eeprom = &acb->eeprom;
        
        host->max_cmd_len = 24;
        host->can_queue = DC395x_MAX_CMD_QUEUE;
        host->cmd_per_lun = DC395x_MAX_CMD_PER_LUN;
        host->this_id = (int)eeprom->scsi_id;
        host->io_port = acb->io_port_base;
        host->n_io_port = acb->io_port_len;
        host->dma_channel = -1;
        host->unique_id = acb->io_port_base;
        host->irq = acb->irq_level;
        acb->last_reset = jiffies;

        host->max_id = 16;
        if (host->max_id - 1 == eeprom->scsi_id)
                host->max_id--;

        if (eeprom->channel_cfg & NAC_SCANLUN)
                host->max_lun = 8;
        else
                host->max_lun = 1;
}


/**
 * adapter_init_chip - Get the chip into a know state and figure out
 * some of the settings that apply to this adapter.
 *
 * The io port in the adapter needs to have been set before calling
 * this function. The config will be configured correctly on return.
 *
 * @acb: The adapter which we are to init.
 **/
static void adapter_init_chip(struct AdapterCtlBlk *acb)
{
        struct NvRamType *eeprom = &acb->eeprom;
        
        /* Mask all the interrupt */
        DC395x_write8(acb, TRM_S1040_DMA_INTEN, 0x00);
        DC395x_write8(acb, TRM_S1040_SCSI_INTEN, 0x00);

        /* Reset SCSI module */
        DC395x_write16(acb, TRM_S1040_SCSI_CONTROL, DO_RSTMODULE);

        /* Reset PCI/DMA module */
        DC395x_write8(acb, TRM_S1040_DMA_CONTROL, DMARESETMODULE);
        udelay(20);

        /* program configuration 0 */
        acb->config = HCC_AUTOTERM | HCC_PARITY;
        if (DC395x_read8(acb, TRM_S1040_GEN_STATUS) & WIDESCSI)
                acb->config |= HCC_WIDE_CARD;

        if (eeprom->channel_cfg & NAC_POWERON_SCSI_RESET)
                acb->config |= HCC_SCSI_RESET;

        if (acb->config & HCC_SCSI_RESET) {
                dprintkl(KERN_INFO, "Performing initial SCSI bus reset\n");
                DC395x_write8(acb, TRM_S1040_SCSI_CONTROL, DO_RSTSCSI);

                /*while (!( DC395x_read8(acb, TRM_S1040_SCSI_INTSTATUS) & INT_SCSIRESET )); */
                /*spin_unlock_irq (&io_request_lock); */
                udelay(500);

                acb->last_reset =
                    jiffies + HZ / 2 +
                    HZ * acb->eeprom.delay_time;

                /*spin_lock_irq (&io_request_lock); */
        }
}


/**
 * init_adapter - Grab the resource for the card, setup the adapter
 * information, set the card into a known state, create the various
 * tables etc etc. This basically gets all adapter information all up
 * to date, initialised and gets the chip in sync with it.
 *
 * @host:       This hosts adapter structure
 * @io_port:    The base I/O port
 * @irq:        IRQ
 *
 * Returns 0 if the initialization succeeds, any other value on
 * failure.
 **/
static int adapter_init(struct AdapterCtlBlk *acb, unsigned long io_port,
                        u32 io_port_len, unsigned int irq)
{
        if (!request_region(io_port, io_port_len, DC395X_NAME)) {
                dprintkl(KERN_ERR, "Failed to reserve IO region 0x%lx\n", io_port);
                goto failed;
        }
        /* store port base to indicate we have registered it */
        acb->io_port_base = io_port;
        acb->io_port_len = io_port_len;
        
        if (request_irq(irq, dc395x_interrupt, IRQF_SHARED, DC395X_NAME, acb)) {
                /* release the region we just claimed */
                dprintkl(KERN_INFO, "Failed to register IRQ\n");
                goto failed;
        }
        /* store irq to indicate we have registered it */
        acb->irq_level = irq;

        /* get eeprom configuration information and command line settings etc */
        check_eeprom(&acb->eeprom, io_port);
        print_eeprom_settings(&acb->eeprom);

        /* setup adapter control block */       
        adapter_init_params(acb);
        
        /* display card connectors/termination settings */
        adapter_print_config(acb);

        if (adapter_sg_tables_alloc(acb)) {
                dprintkl(KERN_DEBUG, "Memory allocation for SG tables failed\n");
                goto failed;
        }
        adapter_init_scsi_host(acb->scsi_host);
        adapter_init_chip(acb);
        set_basic_config(acb);

        dprintkdbg(DBG_0,
                "adapter_init: acb=%p, pdcb_map=%p psrb_array=%p "
                "size{acb=0x%04x dcb=0x%04x srb=0x%04x}\n",
                acb, acb->dcb_map, acb->srb_array, sizeof(struct AdapterCtlBlk),
                sizeof(struct DeviceCtlBlk), sizeof(struct ScsiReqBlk));
        return 0;

failed:
        if (acb->irq_level)
                free_irq(acb->irq_level, acb);
        if (acb->io_port_base)
                release_region(acb->io_port_base, acb->io_port_len);
        adapter_sg_tables_free(acb);

        return 1;
}


/**
 * adapter_uninit_chip - cleanly shut down the scsi controller chip,
 * stopping all operations and disabling interrupt generation on the
 * card.
 *
 * @acb: The adapter which we are to shutdown.
 **/
static void adapter_uninit_chip(struct AdapterCtlBlk *acb)
{
        /* disable interrupts */
        DC395x_write8(acb, TRM_S1040_DMA_INTEN, 0);
        DC395x_write8(acb, TRM_S1040_SCSI_INTEN, 0);

        /* reset the scsi bus */
        if (acb->config & HCC_SCSI_RESET)
                reset_scsi_bus(acb);

        /* clear any pending interrupt state */
        DC395x_read8(acb, TRM_S1040_SCSI_INTSTATUS);
}



/**
 * adapter_uninit - Shut down the chip and release any resources that
 * we had allocated. Once this returns the adapter should not be used
 * anymore.
 *
 * @acb: The adapter which we are to un-initialize.
 **/
static void adapter_uninit(struct AdapterCtlBlk *acb)
{
        unsigned long flags;
        DC395x_LOCK_IO(acb->scsi_host, flags);

        /* remove timers */
        if (timer_pending(&acb->waiting_timer))
                del_timer(&acb->waiting_timer);
        if (timer_pending(&acb->selto_timer))
                del_timer(&acb->selto_timer);

        adapter_uninit_chip(acb);
        adapter_remove_and_free_all_devices(acb);
        DC395x_UNLOCK_IO(acb->scsi_host, flags);

        if (acb->irq_level)
                free_irq(acb->irq_level, acb);
        if (acb->io_port_base)
                release_region(acb->io_port_base, acb->io_port_len);

        adapter_sg_tables_free(acb);
}


#undef YESNO
#define YESNO(YN) \
 if (YN) seq_printf(m, " Yes ");\
 else seq_printf(m, " No  ")

static int dc395x_show_info(struct seq_file *m, struct Scsi_Host *host)
{
        struct AdapterCtlBlk *acb = (struct AdapterCtlBlk *)host->hostdata;
        int spd, spd1;
        struct DeviceCtlBlk *dcb;
        unsigned long flags;
        int dev;

        seq_puts(m, DC395X_BANNER " PCI SCSI Host Adapter\n"
                " Driver Version " DC395X_VERSION "\n");

        DC395x_LOCK_IO(acb->scsi_host, flags);

        seq_printf(m, "SCSI Host Nr %i, ", host->host_no);
        seq_printf(m, "DC395U/UW/F DC315/U %s\n",
                (acb->config & HCC_WIDE_CARD) ? "Wide" : "");
        seq_printf(m, "io_port_base 0x%04lx, ", acb->io_port_base);
        seq_printf(m, "irq_level 0x%04x, ", acb->irq_level);
        seq_printf(m, " SelTimeout %ims\n", (1638 * acb->sel_timeout) / 1000);

        seq_printf(m, "MaxID %i, MaxLUN %llu, ", host->max_id, host->max_lun);
        seq_printf(m, "AdapterID %i\n", host->this_id);

        seq_printf(m, "tag_max_num %i", acb->tag_max_num);
        /*seq_printf(m, ", DMA_Status %i\n", DC395x_read8(acb, TRM_S1040_DMA_STATUS)); */
        seq_printf(m, ", FilterCfg 0x%02x",
                DC395x_read8(acb, TRM_S1040_SCSI_CONFIG1));
        seq_printf(m, ", DelayReset %is\n", acb->eeprom.delay_time);
        /*seq_printf(m, "\n"); */

        seq_printf(m, "Nr of DCBs: %i\n", list_size(&acb->dcb_list));
        seq_printf(m, "Map of attached LUNs: %02x %02x %02x %02x %02x %02x %02x %02x\n",
             acb->dcb_map[0], acb->dcb_map[1], acb->dcb_map[2],
             acb->dcb_map[3], acb->dcb_map[4], acb->dcb_map[5],
             acb->dcb_map[6], acb->dcb_map[7]);
        seq_printf(m, "                      %02x %02x %02x %02x %02x %02x %02x %02x\n",
             acb->dcb_map[8], acb->dcb_map[9], acb->dcb_map[10],
             acb->dcb_map[11], acb->dcb_map[12], acb->dcb_map[13],
             acb->dcb_map[14], acb->dcb_map[15]);

        seq_puts(m,
                 "Un ID LUN Prty Sync Wide DsCn SndS TagQ nego_period SyncFreq SyncOffs MaxCmd\n");

        dev = 0;
        list_for_each_entry(dcb, &acb->dcb_list, list) {
                int nego_period;
                seq_printf(m, "%02i %02i  %02i ", dev, dcb->target_id,
                        dcb->target_lun);
                YESNO(dcb->dev_mode & NTC_DO_PARITY_CHK);
                YESNO(dcb->sync_offset);
                YESNO(dcb->sync_period & WIDE_SYNC);
                YESNO(dcb->dev_mode & NTC_DO_DISCONNECT);
                YESNO(dcb->dev_mode & NTC_DO_SEND_START);
                YESNO(dcb->sync_mode & EN_TAG_QUEUEING);
                nego_period = clock_period[dcb->sync_period & 0x07] << 2;
                if (dcb->sync_offset)
                        seq_printf(m, "  %03i ns ", nego_period);
                else
                        seq_printf(m, " (%03i ns)", (dcb->min_nego_period << 2));

                if (dcb->sync_offset & 0x0f) {
                        spd = 1000 / (nego_period);
                        spd1 = 1000 % (nego_period);
                        spd1 = (spd1 * 10 + nego_period / 2) / (nego_period);
                        seq_printf(m, "   %2i.%1i M     %02i ", spd, spd1,
                                (dcb->sync_offset & 0x0f));
                } else
                        seq_puts(m, "                 ");

                /* Add more info ... */
                seq_printf(m, "     %02i\n", dcb->max_command);
                dev++;
        }

        if (timer_pending(&acb->waiting_timer))
                seq_puts(m, "Waiting queue timer running\n");
        else
                seq_putc(m, '\n');

        list_for_each_entry(dcb, &acb->dcb_list, list) {
                struct ScsiReqBlk *srb;
                if (!list_empty(&dcb->srb_waiting_list))
                        seq_printf(m, "DCB (%02i-%i): Waiting: %i:",
                                dcb->target_id, dcb->target_lun,
                                list_size(&dcb->srb_waiting_list));
                list_for_each_entry(srb, &dcb->srb_waiting_list, list)
                        seq_printf(m, " %p", srb->cmd);
                if (!list_empty(&dcb->srb_going_list))
                        seq_printf(m, "\nDCB (%02i-%i): Going  : %i:",
                                dcb->target_id, dcb->target_lun,
                                list_size(&dcb->srb_going_list));
                list_for_each_entry(srb, &dcb->srb_going_list, list)
                        seq_printf(m, " %p", srb->cmd);
                if (!list_empty(&dcb->srb_waiting_list) || !list_empty(&dcb->srb_going_list))
                        seq_putc(m, '\n');
        }

        if (debug_enabled(DBG_1)) {
                seq_printf(m, "DCB list for ACB %p:\n", acb);
                list_for_each_entry(dcb, &acb->dcb_list, list) {
                        seq_printf(m, "%p -> ", dcb);
                }
                seq_puts(m, "END\n");
        }

        DC395x_UNLOCK_IO(acb->scsi_host, flags);
        return 0;
}


static struct scsi_host_template dc395x_driver_template = {
        .module                 = THIS_MODULE,
        .proc_name              = DC395X_NAME,
        .show_info              = dc395x_show_info,
        .name                   = DC395X_BANNER " " DC395X_VERSION,
        .queuecommand           = dc395x_queue_command,
        .bios_param             = dc395x_bios_param,
        .slave_alloc            = dc395x_slave_alloc,
        .slave_destroy          = dc395x_slave_destroy,
        .can_queue              = DC395x_MAX_CAN_QUEUE,
        .this_id                = 7,
        .sg_tablesize           = DC395x_MAX_SG_TABLESIZE,
        .cmd_per_lun            = DC395x_MAX_CMD_PER_LUN,
        .eh_abort_handler       = dc395x_eh_abort,
        .eh_bus_reset_handler   = dc395x_eh_bus_reset,
        .use_clustering         = DISABLE_CLUSTERING,
};


/**
 * banner_display - Display banner on first instance of driver
 * initialized.
 **/
static void banner_display(void)
{
        static int banner_done = 0;
        if (!banner_done)
        {
                dprintkl(KERN_INFO, "%s %s\n", DC395X_BANNER, DC395X_VERSION);
                banner_done = 1;
        }
}


/**
 * dc395x_init_one - Initialise a single instance of the adapter.
 *
 * The PCI layer will call this once for each instance of the adapter
 * that it finds in the system. The pci_dev strcuture indicates which
 * instance we are being called from.
 * 
 * @dev: The PCI device to initialize.
 * @id: Looks like a pointer to the entry in our pci device table
 * that was actually matched by the PCI subsystem.
 *
 * Returns 0 on success, or an error code (-ve) on failure.
 **/
static int dc395x_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
        struct Scsi_Host *scsi_host = NULL;
        struct AdapterCtlBlk *acb = NULL;
        unsigned long io_port_base;
        unsigned int io_port_len;
        unsigned int irq;
        
        dprintkdbg(DBG_0, "Init one instance (%s)\n", pci_name(dev));
        banner_display();

        if (pci_enable_device(dev))
        {
                dprintkl(KERN_INFO, "PCI Enable device failed.\n");
                return -ENODEV;
        }
        io_port_base = pci_resource_start(dev, 0) & PCI_BASE_ADDRESS_IO_MASK;
        io_port_len = pci_resource_len(dev, 0);
        irq = dev->irq;
        dprintkdbg(DBG_0, "IO_PORT=0x%04lx, IRQ=0x%x\n", io_port_base, dev->irq);

        /* allocate scsi host information (includes out adapter) */
        scsi_host = scsi_host_alloc(&dc395x_driver_template,
                                    sizeof(struct AdapterCtlBlk));
        if (!scsi_host) {
                dprintkl(KERN_INFO, "scsi_host_alloc failed\n");
                goto fail;
        }
        acb = (struct AdapterCtlBlk*)scsi_host->hostdata;
        acb->scsi_host = scsi_host;
        acb->dev = dev;

        /* initialise the adapter and everything we need */
        if (adapter_init(acb, io_port_base, io_port_len, irq)) {
                dprintkl(KERN_INFO, "adapter init failed\n");
                goto fail;
        }

        pci_set_master(dev);

        /* get the scsi mid level to scan for new devices on the bus */
        if (scsi_add_host(scsi_host, &dev->dev)) {
                dprintkl(KERN_ERR, "scsi_add_host failed\n");
                goto fail;
        }
        pci_set_drvdata(dev, scsi_host);
        scsi_scan_host(scsi_host);
                
        return 0;

fail:
        if (acb != NULL)
                adapter_uninit(acb);
        if (scsi_host != NULL)
                scsi_host_put(scsi_host);
        pci_disable_device(dev);
        return -ENODEV;
}


/**
 * dc395x_remove_one - Called to remove a single instance of the
 * adapter.
 *
 * @dev: The PCI device to initialize.
 **/
static void dc395x_remove_one(struct pci_dev *dev)
{
        struct Scsi_Host *scsi_host = pci_get_drvdata(dev);
        struct AdapterCtlBlk *acb = (struct AdapterCtlBlk *)(scsi_host->hostdata);

        dprintkdbg(DBG_0, "dc395x_remove_one: acb=%p\n", acb);

        scsi_remove_host(scsi_host);
        adapter_uninit(acb);
        pci_disable_device(dev);
        scsi_host_put(scsi_host);
}


static struct pci_device_id dc395x_pci_table[] = {
        {
                .vendor         = PCI_VENDOR_ID_TEKRAM,
                .device         = PCI_DEVICE_ID_TEKRAM_TRMS1040,
                .subvendor      = PCI_ANY_ID,
                .subdevice      = PCI_ANY_ID,
         },
        {}                      /* Terminating entry */
};
MODULE_DEVICE_TABLE(pci, dc395x_pci_table);


static struct pci_driver dc395x_driver = {
        .name           = DC395X_NAME,
        .id_table       = dc395x_pci_table,
        .probe          = dc395x_init_one,
        .remove         = dc395x_remove_one,
};


/**
 * dc395x_module_init - Module initialization function
 *
 * Used by both module and built-in driver to initialise this driver.
 **/
static int __init dc395x_module_init(void)
{
        return pci_register_driver(&dc395x_driver);
}


/**
 * dc395x_module_exit - Module cleanup function.
 **/
static void __exit dc395x_module_exit(void)
{
        pci_unregister_driver(&dc395x_driver);
}


module_init(dc395x_module_init);
module_exit(dc395x_module_exit);

MODULE_AUTHOR("C.L. Huang / Erich Chen / Kurt Garloff");
MODULE_DESCRIPTION("SCSI host adapter driver for Tekram TRM-S1040 based adapters: Tekram DC395 and DC315 series");
MODULE_LICENSE("GPL");